Python string tricks from Python Cookbook

All data into the program is just a bunch of bytes

English character takes up one byte Chinese is two bytes one byte byte=8bit

Unicode strings set a uniform and unique binary encoding for each character in each language

Big = R ' This is a \tsting ' R denotes the original, what is inside the string is what, the backslash is a backslash, and will not escape

S.isdigit () determines whether a string is a number

Ord and CHR characters and conversions that correspond to the value of the Andean Code

Ord (a)

Chr (97)

Determine if the object is a string:

def isstringlike (anobj):

Try:anobj + "

Except:return False

Else:return True

String alignment:

S.ljust (20)

S.rjust (20)

S.center (20)

S.center (20, ' + ') is not filled with spaces, but with a plus sign

Strip both ends of the string:

X.lstrip ()

X.rstrip ()

X.strip ()

S.strip (' xy ') can also specify what to remove

Python built-in functions:

Filter (fun, seq)

Map (fun, seq)

Reduce (fun, seq) sequentially iterate

Reduce (fun, seq, starting value)

Lambda X, Y:x+y

Operator module

Import operator

Operator.add

..... subtraction, etc...

Help (operator)

Verbatim reversal of strings:

S[::-1]

Reverse the word only:

Import re

Rev = Re.split (R ' (\s+) ', ' Hello World hahaha! ‘)

Rev.reverse ()

Rev = '. Join (REV) #要用空字符来join because the space is already in the cut list

Returns all elements in a that are not part of B:

Set (a). Difference (set (b))

Translate method:

Import string

s = ' Hello world! '

Table = String.maketrans (' abcde ', ' 12345 ') #先生成对照表

S.translate (table) #依照对照表进行替换操作

S.translate (table, ' wor ') #替换后, delete characters containing wor

If you want to delete only, set the table to: Table = String.maketrans (","), which will only do the delete operation.

3/4 #0

From __future__ Import Division

3/4 #0.75

4//4 #0

Capitalization issues:

S.upper () All Caps

S.lower () All lowercase

S.capitalize () First uppercase, remaining lowercase

S.tittle () capitalize the first letter of each word, the remaining lowercase

S.split ()

S.split (' \ n ')

S.splitlines ()

S.splitlines (True) preserves end-of-line newline characters

Python string tricks from Python Cookbook