A concise tutorial for Python: Basic concepts

1 literal constants, such as 2, ' This is ok ' such a string

>>> print (' a,2,3 ')

a,2,3

2 string

• Single quotation mark (')

  Use single quotation marks to indicate a string, similar to a strong reference in the shell, with all the spaces and tabs intact.

>>> print (' This is OK ')

This is OK

• Double quotation marks (")

  The string in double quotation marks is identical to the string used in single quotation marks

>>> print ("This is OK")

This is OK

• Three quotation marks ("')

  Using three quotation marks, you can indicate a multiline string, and you can use single and double quotation marks freely in three quotes.

>>> ' This is am am string. The first line.

... The second line.

... "What ' s your name?" Lasked.

... He said "Bond,jamesbond."

' This is am am string. This was the first line.\nthis is the second line.\n "What\ 's your name?" Lasked.\nhe said "Bond,jamesbond."

• Escape character

>>> ' what \ ' s your name ' #在单引号中实现单引号的使用

"What ' s your name"

or use double quotation marks

>>> "What ' Your Name"

"What ' Your Name"

>>> "This is \" Ok\ "," #双引号中实现双引号的引用

' This is ' OK ', '

Note: The line end is a separate backslash, indicating that the string continues on the next line, such as:

>>> ' This is ok\

..., hello '

' This is Ok,hello '

• Natural string

  If you do not need a string that is specially handled as an escape character, you can prefix the string with R or R to specify a natural string

>>> R ' New line is by \ n '

' New line is by \\n '

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A concise tutorial for Python: Basic concepts