Python:Strings

Strings are immutable, all methods return a new string

Formatting

Basic

str1.replace(old,new[,cnt])

In str1 replace old by new (cnt times)

str1.join(list)

Join list (or set or other sequence) with str1 as separator

str1.split(sep[,max)

Split string in to a list on sep into max + 1 elements (remainder is put in last element)

str1.splitlines([keepends])

Split on newline, with keepends the newline is preserved.

str1.center(w)

str1.ljust(w)

str1.rjust(w)

Put spaces around str1 to length 'w' is reached.

str1.expandtabs(size)

Replace tabs by 'size' number of spaces

Advanced

str1.format(values)

Fill in 'values' in string-fields ({}), if numbered fields can be in a different format than the values.

If values are in a dict, they can be addressed by their key.

Code Example

 
"Value 1: {}, Value2: {}".format(1,2)
"Value 2: {1}, Value1: {0}".format(1,2)

dict1 = {'value1':1, 'value2':2}
"Value 2: {value2}, Value1: {value1}".format(dict1)

{[field]:spec}

The format can be specified after the (optional) fieldnumber.

<alignment><width>.<precision><type>

Generic format specification. Anything not needed can be left out.

Alignment

Always show sign

<	Left
>	Right
^	Center
=	Padding (after sign)
#	Prepend for x, o and b types

Types

c	Character
d	decimal
f	Float
%	Percent
o	Octal
x	Hexadecimal
b	Binary
e	Exponent
g	Python chooses between decimal, float or exponent