python int str bool List dict Data operation method Summary

Str

Slice Str[start:end] Note: Gu Tou regardless of tail

STR[M:N:S] s for step

Case Conversion Ret1 = S1.capitalize () Capitalize first letter ret = S1.lower () convert all to write
ret = S1.upper () convert all to write

ret = S1.swapcase ()?? Write to convert each other

ret = S1.casefold () convert all to write
ret = S3.title () Each word separated by a special character?? Word?? Write

Various cutting

ret = S5.center (10, "*") pull into 10, put the original string in the middle. The rest of the position

S6.expandtabs () can change \ t's degree, default? degree changed to 8

ret = S7.strip () remove left and right spaces

ret = S7.lstrip () Remove left space

ret = S7.rstrip () Remove the right space

S7.strip ("ABC") can also specify which elements are removed

Replace

ret = S8.replace (' Alex ', '??? King ') to replace Alex with??? Wang

ret = s8.replace (' i ', ' SB ', 2) Replace I to SB, replace 2

9 = "Alex,wusir,sylar,taibai,eggon"
LST = S9.split (",") string cut, according to, in-cut

Format and output

S12 = "My name is%s, this year%d years old, I like%s"% (' Sylar ', 18, ' Jay Chou ')

Find

Ret1 = S13.startswith ("Sylar") determines whether to start with Sylar

Ret3 = S13.endswith ("Language?") Is it a ' language? ' End

Ret7 = S13.count ("a") find the number of occurrences of "a"

Ret5 = S13.find ("Sylar") find where ' Sylar ' appears
Ret7 = S13.find ("A", 8, 22) cut to find

Ret8 = S13.index ("Sylar") Quest position. Attention. If the index is not found. Program will error

Conditional judgment

is print (S14.isalnum ()) made up of words and numbers?

is print (S14.isalpha ()) composed of words?

Print (S14.isdigit ()) whether the number consists of

ret = Len (S18) calculates the degree of a string

List

　　　　　　　　

　　　　

python int str bool List dict Data operation method Summary