python string, regular -xdd

1. Split string

str.split (sep, maxsplit) # (delimiter, several times)

2. Merge string

= str2 String .join (Iterable) str2 = # ' @ ' .join (List1) is a list List1 #

 3. Retrieve string

• count()
• find()
• start with ()
• endwith()

 4. The letter case change

• lower()
• upper()

 5. Remove the string spaces and special characters

• strip () # remove the string around the spaces and special characters
• lstrip () # remove the left side ....
• rstrip () # remove the right of ...

6. The format string

• use%

' % [-] [+] [0] [m] formatting characters [n-.] ' % A
 # - an optional parameter, left-justified, unsigned positive number in front of, 
# + optional parameters, right-aligned, a positive number plus + sign in front of 
# 0 optional parameter by aligned front unsigned positive number, the space is filled with 0, and m is generally used with 
# optional parameter m, the parameter indicates occupy 
# .n optional parameters, the decimal places bits 
# formatting characters for specifying the type of 
% s% d% f% e %%

• Use Format ()

Print ( ' the result is: {}. 2F :. ' .format (A), ' and ' ,    ' {:} .5f ' .format (B))
 Print ( ' the result is: {}. 2F :. ' .format ( A) + ' and ' +   ' {:} .5f ' .format (B))
 # can be

 7. encoding and decoding python default in UTF-8

= STR ' black ~ tao Sucker ' 
AA = str.encode ()
 Print (AA) 
BB = aa.decode ()
 Print (BB)

 8. Regular