Python Learning string

1.String type: A finite sequence consisting of 0 or more characters

Note: In Python, double and single quotes have the same meaning and can be used to represent strings. 2. String-built functions and operatorsstrip () remove whitespace, assign value to new variable

"= a.strip ()print(b)

Split () splits the string into a list of multiple strings.

' a b c D '  = a.split ()print(b)

Len () calculates the string length

' a b c D ' Print (Len (a))

index () to find where the element is located

' a b c D ' Print (A.index ('b'))

[start:end:step] slices, getting substrings from a string

' a b c D ' Print (A[0:5:1])

3. String formatting:

string formatting is the connection, substitution, and return of a new compliant string only by the specified rule. the expression syntax for formatting strings in Python is: format_string% String_to_convert or format_string% (string_to_convert1,string_to_convert2,...)

Print ("Hello%s, age:%d" % ("Simon", 24))

formatting of the string format ()

s="Hello {0},age {1}"    #{0},{1} is a placeholder s1=s.format ('  Simon','the ')print(S1)

In addition to formatting, sometimes you need to adjust the format symbol display method, the auxiliary format conforms to meet these requirements.

fixed content in a formatted string can contain non-displayed characters in addition to characters that can be displayed , such as letters, numbers, punctuation, and so on. This character is called an escape character . Disables the escape character with ' R '.

4. String connection join ()

Li = ["a""b""_". Join (LI)print(L1)

5. String separator spilt () and partition ()

difference: Split () passed in parameters, disappeared after segmentation, output as a listpartition () The parameters passed in, the partition exists, the output is a tupleSplitlines () split with newline (\ n) characters

' AXBCD '  = a.partition ('x' = A.split ('x')  Print(b)     #(' A ', ' X ', ' BCD ')print(d)     # [' A ', ' BCD ']

6.id () View the memory address of a string or number

' Simon '  = ID (a)print(b)    #2767282156912

   

Python Learning string