Capitalize the first letter of the capitalize string

name = 'xmzncc'
v = name.capitalize()
print(v)

casefold lowercase all capitals (supports multiple national languages)

name = 'Xmzncc'
v = name.casefold()
print(v)

lower converts capitals to lowercase (English only)

name = 'Xmzncc'
v = name.lower()
print(v)

center text centered
Parametric 1: Represents the total length
Parametric 2: Characters filled in the blank (length 1)

name = 'xmzncc'
v = name.center(20,'*')
print(v)

rjust,ljust fills around, including its own length

name = 'xmzncc'
v = name.rjust(20,'*')
print(v)

name = 'xmzncc'
v = name.ljust(20,'*')
print(v)

count denotes the number of times an incoming string appears
Parametric 1: The value to be looked up (subsequence)
Parametric 2: Starting position (index)
Parametric 3: End position (index)

name = 'asdasdjasdhaiuyeluqjh'
v = name.count('as')
print(v)

Does endswith end with xx

name = 'xmzncc'
v = name.endswith('cc')
print(v)

Does startswith Start with xx

name = 'xmzncc'
v = name.startswith('xm')
print(v)

Index finds the location of the specified subsequence index

name = 'xmzncc'
v = name.index('c')
print(v)

find finds the location of the specified subsequence index, does not return - 1, and does not report an error.
Unlike index, index cannot find an error

name = 'xmzncc'
v = name.find('f')
print(v)

format string formatting

tpl = 'I am:{0};Age{1};Gender{2}'
v = tpl.format('fcc',18,'man')
print(v)

Is isalnum/isalpha a Number or Chinese Character

name  = 'xmzncc Pham Xuan Thanh'
v = name.isalnum() 
print(v)
v2 = name.isalpha()
print(v2)

isdecima/isdigit/isnumeric to determine whether it is a number
isdecima can only judge Arabic numerals
isdigit can judge Arabic numerals, 2
isnumeric can judge Arabic numerals, 2 and 3

name = '2'
v1 = name.isdecimal()
print(v1)
v2 = name.isdigit()
print(v2)
v3 = name.isnumeric()
print(v3)

Is isidentifier an indicator
Except for built-in keywords

name = 'xmzncc'
v = name.isidentifier()
print(v)

Is islower all lowercase?

name ='Xmzncc'
v = name.islower()
print(v)

Is isupper all capitalized?

name = 'XMZNCC'
v = name.isupper()
print(v)

upper all capitalized

name = 'xmzncc'
v = name.upper()
print(v)

lower all lowercase

name = 'XMZNCC'
v = name.lower()
print(v)

Does isprintable contain implied xxx
If there is a return to False

name = 'asdasdadasd\tsadasd'
v = name.isprintable()
print(v)

Is isspace all blank?

name = '     '
v = name.isspace()
print(v)

join element stitching string

name = 'xmzncc'
v = '_'.join(name)
print(v)

Translation Correspondence Re-translation
That is to say, find and replace

m = str.maketrans('asd','xxx')
name = "123asd890"
v = name.translate(m)
print(v)

partition splits and retains the splitting elements

name = 'xmzncc000fcc'
v = name.partition('000')
print(v)

replace substitution
Settable Index Location

name = 'xmzncc000fcc000asdasd'
v = name.replace('000','111',1)
print(v)

strip removes blanks

name = 'xmzncc\n'
v = name.strip()
print(v)

swapcase case case-to-case conversion

name = 'XMznCC'
v = name.swapcase()
print(v)

zfill fill0

name = 'xmzncc'
v = name.zfill(20)
print(v)

Summary of string functions:

name.upper()
name.lower()
name.split()
name.find()
name.strip()
name.startswith()
name.format()
name.replace()
"xmzncc".join(["as",'bb'])

Additional functions:

name[0]
name[0:3]
name[0:3:2]
len(name)
for Loop, each element is a character