Unicode String
In Python 3, all strings are represented in
Unicode. In Python 2 are stored internally as 8-bit ASCII, hence it is required
to attach 'u' to make it Unicode. It is no longer necessary now.
Built-in String Methods
Python includes the following built-in methods to
manipulate strings-
S.No
|
Methods
|
Description
|
1
|
Capitalize
first letter of string.
|
|
2
|
Returns a string padded with fillchar with the original string centered to a total
of width columns.
|
|
3
|
Counts how many times str occurs in string or
in a substring of string if starting index beg and ending index end are
given.
|
|
4
|
Decodes the string using the codec
registered for encoding. encoding defaults to the default string encoding.
|
|
5
|
Returns encoded string version of string; on
error, default is to raise a ValueError unless errors is given with 'ignore'
or 'replace'.
|
|
6
|
Determines if string or a substring of
string (if starting index beg and ending index end are given) ends with
suffix; returns true if so and false otherwise.
|
|
7
|
Expands tabs in string to multiple spaces;
defaults to 8 spaces per tab if tabsize not provided.
|
|
8
|
Determine if str occurs in string or in a
substring of string if starting index beg and ending index end are given
returns index if found and -1 otherwise.
|
|
9
|
Same as find(), but raises an exception if
str not found.
|
|
10
|
Returns true if string has at least 1
character and all characters are alphanumeric and false otherwise.
|
|
11
|
Returns true if string has at least 1
character and all characters are alphabetic and false otherwise.
|
|
12
|
Returns true if the string contains only
digits and false otherwise.
|
|
13
|
Returns true if string has at least 1 cased
character and all cased characters are in lowercase and false otherwise.
|
|
14
|
isnumeric(
)
|
Returns true if a Unicode string contains
only numeric characters and false otherwise.
|
15
|
isspace(
)
|
Returns true if string contains only
whitespace characters and false otherwise.
|
16
|
istitle(
)
|
Returns true if string is properly “titlecased”
and false otherwise.
|
17
|
isupper(
)
|
Returns true if string has at least one
cased character and all cased characters are in uppercase and false
otherwise.
|
18
|
join(seq)
|
Merges (concatenates) the string
representations of elements in sequence seq into a string, with separator string.
|
19
|
len(string)
|
Returns the length of the string.
|
20
|
ljust(width[,
fillchar])
|
Returns a space-padded string with the
original string left-justified to a total of width columns.
|
21
|
lower(
)
|
Converts all uppercase letters in string to
lowercase.
|
22
|
lstrip(
)
|
Removes all leading whitespace in string.
|
23
|
maketrans()
|
Returns a translation table to be used in
translate function.
|
24
|
max(str)
|
Returns the max alphabetical character from
the string str.
|
25
|
min(str)
|
Returns the min alphabetical character from
the string str.
|
26
|
replace(old,
new [, max])
|
Replaces all occurrences of old in string
with new or at most max occurrences if max given.
|
27
|
rfind(str,
beg=0, end=len(string))
|
Same as find(), but search backwards in
string.
|
28
|
rindex(str,
beg=0, end=len(string))
|
Same as index(), but search backwards in
string.
|
29
|
Rjust(width,[,fillchar])
|
Returns a space-padded string with the original
string right-justified to a total of width columns.
|
30
|
rstrip()
|
Removes all trailing whitespace of string.
|
31
|
split(str="",
num=string.count(str))
|
Splits string according to delimiter str
(space if not provided) and returns list of substrings; split into at most
num substrings if given.
|
32
|
splitlines(
num=string.count('\n'))
|
Splits string at all (or num) NEWLINEs and
returns a list of each line with NEWLINEs removed.
|
33
|
startswith(str,
beg=0,end=len(string))
|
Determines if string or a substring of
string (if starting index beg and ending index end are given) starts with
substring str; returns true if so and false otherwise.
|
34
|
strip([chars])
|
Performs both lstrip() and rstrip() on
string
|
35
|
swapcase()
|
Inverts case for all letters in string.
|
36
|
title()
|
Returns "titlecased" version of
string, that is, all words begin with uppercase and the rest are lowercase.
|
37
|
translate(table,
deletechars="")
|
Translates string according to translation
table str(256 chars), removing those in the del string.
|
38
|
upper()
|
Converts lowercase letters in string to
uppercase
|
39
|
zfill
(width)
|
Returns original string leftpadded with
zeros to a total of width characters;intended for numbers, zfill() retains
any sign given (less one zero).
|
40
|
isdecimal()
|
Returns true if a unicode string contains
only decimal characters and false otherwise.
|
