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stay Python In the program , If we enclose single or multiple characters in single or double quotation marks , Can represent a string .
Processing strings
>>> s1 = 'hello, world!'
>>> s2 = "hello, world!"
>>> s3 = """
hello,
world!
"""
>>> print(s1, s2, s3, end='')
hello, world! hello, world!
hello,
world!
>>> s4 = """ my # Strings that begin with three double or single quotation marks can wrap
name
is
axyzdong
"""
>>> print(s4)
my
name
is
axyzdong
You can add r , Make it the original string .“ Original string ” Ignore all escape characters at all .
>>> print(r'my name is axyzdong \n')
my name is axyzdong \n
>>> print('my name is \n axyzdong ')
my name is
axyzdong
- String subscripts and slices
>>> spam = 'Hello world!'
>>> spam[0]
'H'
>>> spam[-1]
'!'
>>> spam[0:1]
'H'
>>> spam[0:2]
'He'
>>> spam[:5]
'Hello'
>>> spam[6:]
'world!'
notes ：spam[0:1] in [0:1] Equivalent to the half open and half closed interval in Mathematics [0,1)
>>> 'Hello' in 'Hello world!'
True
>>> 'hello' in 'Hello world!' # There's a difference in case
False
>>> 'world' in 'Hello world!'
True
>>> 'my' in 'Hello world!'
False
Common string methods
>>> spam1 = 'hello world!'
>>> print(len(spam1)) # Get string length
12
>>> print(spam1.capitalize ()) # Capitalized copy of string letters
Hello world!
>>> print(spam1.title ()) # Capitalized copy of the first letter of each word
Hello World!
>>> print(spam1.upper ()) # Copy of the string after capitalization
HELLO WORLD!
>>> print(spam1.find ('world')) # Find the location of the string
6
>>> print(spam1.startswith ('he')) # Check whether the string starts with a specific string
True
>>> print(spam1.startswith ('He'))
False
>>> print(spam1.endswith ('he')) # Check whether the string ends with a specific string
False
>>> print(spam1.endswith ('!'))
True
>>> print(spam1.center (20,'*')) # Centers the string with the specified width and fills both sides with the specified characters
****hello world!****
>>> print(spam1.rjust (20,' ')) # Places the string to the right with the specified width and fills the left with the specified characters
hello world!
>>> spam2 = '123abc'
>>> print(spam2.isdigit ()) # Check whether the string is all composed of numbers
False
>>> print(spam2.isalpha ()) # Check whether the string is all composed of letters
False
>>> print(spam2.isalnum ()) # Check whether the string is composed of numbers and letters
True
>>> spam3 = ' [email protected] ' # Get a copy of the string after the left and right spaces
>>> print(spam3.strip ())
[email protected]
>>> print(spam3)
[email protected]
>>> a, b = 1,2
>>> print('%d + %d = %d'% (a,b,a+b))
1 + 2 = 3
>>> print(f'{a} + {b} = {a+b}') #Python3.6 After simple formatting
1 + 2 = 3
- pyperclip Module copy and paste string
pyperclip Module has copy() and paste() function , Text can be sent to the cutting board of the computer , Or receive text from another .
>>> import pyperclip
>>> pyperclip.copy ('Hello world!')
>>> pyperclip.paste ()
'pyperclip
reference
[1]：https://github.com/jackfrued/Python-100-Days[2]：Python Programming fast : Automate tedious work / ( beautiful ) Svegart (A1 Sweigart) Writing ; Translated by Wang Haipeng . Beijing : People's post and Telecommunications Press ,2016.7
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