Python string operations (capture/replace/search/split)

Python uses the variable [header Subscript: tail subscript] to intercept the corresponding string. The subscript starts from 0 and can be a positive or negative number, the subscript can be null, indicating that the header or tail is obtained.

# Example 1: string truncation STR = '000000' print STR []> 1 # print STR []> 12345678 # output STR position 1 start to position 6 character num = 18str = '000000' + STR (Num) # merge string print STR [-5:] # output string right 5 digits> 00018

 

The replacement string in python uses the variable. Replace ("replaced content", "replaced content" [, times]). The replacement times can be null, indicating that all replicas are replaced. Note that the replacement string with replace is only a temporary variable and must be assigned a value to save it.

# Example 2: String replacement STR = 'akakak' STR = Str. replace ('k', '8') # Replace all K in the string with 8 print STR> 'a8a8a8 '# output result

 

Python searches for strings using variables. find ("content to be searched" [, start position, end position]), start position and end position, indicating the range to be searched. If it is null, it indicates searching for all. After searching, the system returns the position starting from 0. if it finds the position, the system returns-1.

# Example 3: string search str = 'a, hello' print Str. Find ('hello') # search string 'hello' in string 'str'> 2 # output result

 

The Python delimiter uses the variable. Split ("delimiter" [number of splits]). The number of splits indicates the maximum number of splits. If it is null, the splits all.

Example 4: Str = 'a, B, c, d' strlist = Str. split (',') # Use commas to separate the STR string and save it to the list for value in strlist: # print value> A # output result> B> C> d