第一个Python程序#

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(base) C:\Users\123>python
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Python 3.11.7 | packaged by Anaconda, Inc. | (main, Dec 15 2023, 18:05:47) [MSC v.1916 64 bit (AMD64)] on win32
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Type "help", "copyright", "credits" or "license" for more information.
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>>> print('Hello world')
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Hello world
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>>> print("Hello world")
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Hello world
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>>> name = input('请输入你的名字')
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请输入你的名字'Turin'
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>>> print(name)
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'Turin'
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>>> print('Hello',name)
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Hello 'Turin'
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>>> 2**10
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1024
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>>>

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prompt运行.py #

prompt窗口1

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PS D:\7_python_project\1-1 python base> python 1-1第一个python程序.py
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hello world
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hello worldhello world
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hello world hello world
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300
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1024*1024 = 1048576
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please enter your name: Turin
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hello, Turin
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PS D:\7_python_project\1-1 python base>

.py文件

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print("hello world"); #Python中的分号可以省略，主要通过换行来识别语句的结束
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print("hello world""hello world");
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print("hello world","hello world"); #print()会依次打印每个字符串，遇到逗号“,”会输出一个空格，因此，输出的字符串是拼起来的
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print(100 + 200)
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print('1024*1024 =',1024*1024)
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name = input('please enter your name: ')
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print('hello,', name)

prompt窗口2

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版权所有 (C) Microsoft Corporation。保留所有权利。
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尝试新的跨平台 PowerShell https://aka.ms/pscore6
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PS D:\7_python_project> cd '.\1-1 python base\'
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PS D:\7_python_project\1-1 python base> python 1-1第一个python程序.py
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hello world
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hello worldhello world
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hello world hello world
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300
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1024*1024 = 1048576
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Turin
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PS D:\7_python_project\1-1 python base> python 1-1第一个python程序.py
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hello world
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hello world hello world
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300
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1024*1024 = 1048576
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w
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PS D:\7_python_project\1-1 python base> python 1-1第一个python程序.py
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hello world
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hello worldhello world
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300
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1024*1024 = 1048576
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w
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PS D:\7_python_project\1-1 python base>
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PS D:\7_python_project\1-1 python base>
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PS D:\7_python_project\1-1 python base> python
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Python 3.10.2 (tags/v3.10.2:a58ebcc, Jan 17 2022, 14:12:15) [MSC v.1929 64 bit (AMD64)] on win32
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Type "help", "copyright", "credits" or "license" for more information.
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>>> name = input()
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Turin
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>>> print(name)
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Turin
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>>> name = input('please enter your name: ')
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please enter your name: print('hello,', name)
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>>>
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>>>
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>>>
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KeyboardInterrupt
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PS D:\7_python_project\1-1 python base> python 1-1第一个python程序.py
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hello world
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hello worldhello world
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hello world hello world
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300
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1024*1024 = 1048576
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please enter your name: Turin
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hello, Turin
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PS D:\7_python_project\1-1 python base> print('1024 * 768 ='1024 * 768 )
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所在位置 行:1 字符: 21
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+ print('1024 * 768 ='1024 * 768 )
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+                     ~~~~
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表达式或语句中包含意外的标记“1024”。
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所在位置 行:1 字符: 21
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+ print('1024 * 768 ='1024 * 768 )
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+                     ~
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表达式中缺少右“)”。
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所在位置 行:1 字符: 32
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+ print('1024 * 768 ='1024 * 768 )
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+                                ~
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表达式或语句中包含意外的标记“)”。
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    + CategoryInfo          : ParserError: (:) [], ParentContainsErrorRecordException
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    + FullyQualifiedErrorId : UnexpectedToken
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PS D:\7_python_project\1-1 python base> print('1024 * 768 ='1024 * 768 ^C
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PS D:\7_python_project\1-1 python base> print('1024 * 768 ='1024 * 768 ^C
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PS D:\7_python_project\1-1 python base> ^C
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PS D:\7_python_project\1-1 python base> python
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Python 3.10.2 (tags/v3.10.2:a58ebcc, Jan 17 2022, 14:12:15) [MSC v.1929 64 bit (AMD64)] on win32
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Type "help", "copyright", "credits" or "license" for more information.
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>>> print('1024 * 768 ='1024 * 768 )
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  File "<stdin>", line 1
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    print('1024 * 768 ='1024 * 768 )
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          ^^^^^^^^^^^^^^^^^^^^^^^^
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SyntaxError: invalid syntax. Perhaps you forgot a comma?
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>>>
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KeyboardInterrupt
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>>> print('\\\t\\')
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\       \
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>>> print(r'\\\t\\')
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\\\t\\
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>>> print(''' line1
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... ...line2
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... ...line3''')
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 line1
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...line2
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...line3
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>>>
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>>> print('''line1
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... line2
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... line3
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... '''
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... ^Z
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KeyboardInterrupt
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>>> print('''line1
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... line2
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... line3''')
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line1
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line2
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line3
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>>> True
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True
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>>> True
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True
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>>> 3 > 0
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True
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>>> False or False
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False
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>>> not 1 = 1
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  File "<stdin>", line 1
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    not 1 = 1
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    ^^^^^
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SyntaxError: cannot assign to expression
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>>> not 1==1
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False
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>>> n = 123
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>>> f = 456.789
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>>> s1 = 'Hello, world'
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>>> s2 = 'Hello, \'Adam\''
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>>> s3 = r'Hello, "Bart"'
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>>> s4 = r'''Hello,
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... Lisa!'''
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>>> print(n\n,f,s1,s2,s3,s4)
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  File "<stdin>", line 1
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    print(n\n,f,s1,s2,s3,s4)
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            ^
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SyntaxError: unexpected character after line continuation character
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>>> n = 123
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>>> f = 456.789
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>>> s1 = 'Hello, world'
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>>> s2 = 'Hello, \'Adam\''
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>>> s3 = r'Hello, "Bart"'
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>>> s4 = r'''Hello,
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... Lisa!'''
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>>> print(n\t,f,s1,s2,s3,s4)
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  File "<stdin>", line 1
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    print(n\t,f,s1,s2,s3,s4)
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            ^
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SyntaxError: unexpected character after line continuation character
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>>> n = 123
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>>> f = 456.789
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>>> s1 = 'Hello, world'
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>>> s2 = 'Hello, \'Adam\''
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>>> s3 = r'Hello, "Bart"'
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>>> s4 = r'''Hello,
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... Lisa!'''
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>>> print('n\n,f,s1,s2,s3,s4')
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n
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,f,s1,s2,s3,s4
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>>> ord('A')
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65
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>>> ord('中')
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20013
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>>> chr(66)
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'B'
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>>> chr(66)
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'B'
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>>> '\u4e2d\u6587'
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'中文'
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>>> x = b'ABC'
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>>> 'ABC'.encode('ascii')
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b'ABC'
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>>> '中文'.encode('UTF-8')
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b'\xe4\xb8\xad\xe6\x96\x87'
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>>> '中文'.encode('ascii')
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Traceback (most recent call last):
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  File "<stdin>", line 1, in <module>
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UnicodeEncodeError: 'ascii' codec can't encode characters in position 0-1: ordinal not in range(128)
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>>> b'ABC'.decode('UTF-8')
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'ABC'
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>>> len('中文')
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2
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>>> len('中文'.encode('utf-8'))
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6
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>>> 'Hello, %s' % 'world'
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'Hello, world'
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>>> 'Hello,%s' & 'world'
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Traceback (most recent call last):
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  File "<stdin>", line 1, in <module>
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TypeError: unsupported operand type(s) for &: 'str' and 'str'
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>>> 'Hello,%s' %'world'
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'Hello,world'
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>>> 'Hi,&s,You have %d
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**PS:当`str`和`bytes`互相转换时,没有特殊要求，指定使用UTF-8编码**
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# 问题及解决方案
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-   [Vscode提示“无法在只读编辑器中编辑”解决方法\_vscode编辑器关闭只读模式-CSDN博客](https://blog.csdn.net/m0_52592128/article/details/120798138)
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 %('Meter',100000)
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Traceback (most recent call last):
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  File "<stdin>", line 1, in <module>
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TypeError: %d format: a real number is required, not str
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>>> 'Hi,%s,You have %d
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**PS:当`str`和`bytes`互相转换时,没有特殊要求，指定使用UTF-8编码**
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# 问题及解决方案
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-   [Vscode提示“无法在只读编辑器中编辑”解决方法\_vscode编辑器关闭只读模式-CSDN博客](https://blog.csdn.net/m0_52592128/article/details/120798138)
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 %('Meter',100000)
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'Hi,Meter,You have 100000
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**PS:当`str`和`bytes`互相转换时,没有特殊要求，指定使用UTF-8编码**
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# 问题及解决方案
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-   [Vscode提示“无法在只读编辑器中编辑”解决方法\_vscode编辑器关闭只读模式-CSDN博客](https://blog.csdn.net/m0_52592128/article/details/120798138)
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>>> 'Hi,&s,You have %d
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**PS:当`str`和`bytes`互相转换时,没有特殊要求，指定使用UTF-8编码**
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# 问题及解决方案
211

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-   [Vscode提示“无法在只读编辑器中编辑”解决方法\_vscode编辑器关闭只读模式-CSDN博客](https://blog.csdn.net/m0_52592128/article/details/120798138)
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 %('Meter',100000)
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Traceback (most recent call last):
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  File "<stdin>", line 1, in <module>
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TypeError: %d format: a real number is required, not str
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>>> print('%2d-%02d' % (3, 1))
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 3-01
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>>> print('%.2f' % 3.1415926)
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3.14
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>>> 'Age: %s. Gender: %s' % (25, True)
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'Age: 25. Gender: True'
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>>> 'growth rate: %d %%' % 7
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'growth rate: 7 %'
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>>> '中文'.encode('gb2312')
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b'\xd6\xd0\xce\xc4'
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>>> 'Hello,{0}的成绩提高了{1:.1f}'.format('小明',17.125)
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'Hello,小明的成绩提高了17.1'
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>>> print(f'^Z')
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KeyboardInterrupt
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>>> s = '小明'
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>>> a = '85'
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>>> print(f'Hello,{s}的成绩为{a}')
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Hello,小明的成绩为85
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>>> s1=72
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>>> s2=85
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>>> rate = s1/85
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>>> print(f'小明的成绩从去年的{s1}分提升到了今年的{s2}分，提升了{rate}%')
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小明的成绩从去年的72分提升到了今年的85分，提升了0.8470588235294118%
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>>> s1=72
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>>> s2=85
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>>> rate = s1/85
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>>> s2=85^Z^Z^Z^Z^Z^Z^Z^Z^Z^Z^Z^Z^Z
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KeyboardInterrupt
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>>>