How do i put all the letters in a string array in python?

How do I split a string into a list of characters? str.split does not work.

"foobar"    →    ['f', 'o', 'o', 'b', 'a', 'r']

How do i put all the letters in a string array in python?

Mateen Ulhaq

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asked Feb 12, 2011 at 15:14

3

Use the list constructor:

>>> list("foobar")
['f', 'o', 'o', 'b', 'a', 'r']

list builds a new list using items obtained by iterating over the input iterable. A string is an iterable -- iterating over it yields a single character at each iteration step.

How do i put all the letters in a string array in python?

Mateen Ulhaq

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answered Feb 12, 2011 at 15:16

user225312user225312

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3

You take the string and pass it to list()

s = "mystring"
l = list(s)
print l

answered Feb 12, 2011 at 15:16

Senthil KumaranSenthil Kumaran

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You can also do it in this very simple way without list():

>>> [c for c in "foobar"]
['f', 'o', 'o', 'b', 'a', 'r']

answered Mar 24, 2015 at 6:00

3

If you want to process your String one character at a time. you have various options.

uhello = u'Hello\u0020World'

Using List comprehension:

print([x for x in uhello])

Output:

['H', 'e', 'l', 'l', 'o', ' ', 'W', 'o', 'r', 'l', 'd']

Using map:

print(list(map(lambda c2: c2, uhello)))

Output:

['H', 'e', 'l', 'l', 'o', ' ', 'W', 'o', 'r', 'l', 'd']

Calling Built in list function:

print(list(uhello))

Output:

['H', 'e', 'l', 'l', 'o', ' ', 'W', 'o', 'r', 'l', 'd']

Using for loop:

for c in uhello:
    print(c)

Output:

H
e
l
l
o

W
o
r
l
d

How do i put all the letters in a string array in python?

dtasev

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answered Jun 3, 2017 at 14:48

How do i put all the letters in a string array in python?

SidSid

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1

If you just need an array of chars:

arr = list(str)

If you want to split the str by a particular delimiter:

# str = "temp//temps" will will be ['temp', 'temps']
arr = str.split("//")

answered Dec 13, 2018 at 21:31

How do i put all the letters in a string array in python?

0

I explored another two ways to accomplish this task. It may be helpful for someone.

The first one is easy:

In [25]: a = []
In [26]: s = 'foobar'
In [27]: a += s
In [28]: a
Out[28]: ['f', 'o', 'o', 'b', 'a', 'r']

And the second one use map and lambda function. It may be appropriate for more complex tasks:

In [36]: s = 'foobar12'
In [37]: a = map(lambda c: c, s)
In [38]: a
Out[38]: ['f', 'o', 'o', 'b', 'a', 'r', '1', '2']

For example

# isdigit, isspace or another facilities such as regexp may be used
In [40]: a = map(lambda c: c if c.isalpha() else '', s)
In [41]: a
Out[41]: ['f', 'o', 'o', 'b', 'a', 'r', '', '']

See python docs for more methods

answered Sep 10, 2014 at 19:07

2

The task boils down to iterating over characters of the string and collecting them into a list. The most naïve solution would look like

result = []
for character in string:
    result.append(character)

Of course, it can be shortened to just

result = [character for character in string]

but there still are shorter solutions that do the same thing.

list constructor can be used to convert any iterable (iterators, lists, tuples, string etc.) to list.

>>> list('abc')
['a', 'b', 'c']

The big plus is that it works the same in both Python 2 and Python 3.

Also, starting from Python 3.5 (thanks to the awesome PEP 448) it's now possible to build a list from any iterable by unpacking it to an empty list literal:

>>> [*'abc']
['a', 'b', 'c']

This is neater, and in some cases more efficient than calling list constructor directly.

I'd advise against using map-based approaches, because map does not return a list in Python 3. See How to use filter, map, and reduce in Python 3.

answered Apr 5, 2016 at 17:24

How do i put all the letters in a string array in python?

vaultahvaultah

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1

split() inbuilt function will only separate the value on the basis of certain condition but in the single word, it cannot fulfill the condition. So, it can be solved with the help of list(). It internally calls the Array and it will store the value on the basis of an array.

Suppose,

a = "bottle"
a.split() // will only return the word but not split the every single char.

a = "bottle"
list(a) // will separate ['b','o','t','t','l','e']

tuomastik

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answered Aug 18, 2018 at 6:53

Unpack them:

word = "Paralelepipedo"
print([*word])

answered Nov 26, 2019 at 12:47

How do i put all the letters in a string array in python?

enbermudasenbermudas

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To split a string s, the easiest way is to pass it to list(). So,

s = 'abc'
s_l = list(s) #  s_l is now ['a', 'b', 'c']

You can also use a list comprehension, which works but is not as concise as the above:

s_l = [c for c in s]

There are other ways, as well, but these should suffice. Later, if you want to recombine them, a simple call to "".join(s_l) will return your list to all its former glory as a string...

answered Dec 17, 2020 at 6:53

How do i put all the letters in a string array in python?

Gary02127Gary02127

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You can use extend method in list operations as well.

>>> list1 = []
>>> list1.extend('somestring')
>>> list1
['s', 'o', 'm', 'e', 's', 't', 'r', 'i', 'n', 'g']

Georgy

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answered Sep 6, 2020 at 19:23

If you wish to read only access to the string you can use array notation directly.

Python 2.7.6 (default, Mar 22 2014, 22:59:38) 
[GCC 4.8.2] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> t = 'my string'
>>> t[1]
'y'

Could be useful for testing without using regexp. Does the string contain an ending newline?

>>> t[-1] == '\n'
False
>>> t = 'my string\n'
>>> t[-1] == '\n'
True

answered May 17, 2014 at 14:28

SylvainSylvain

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Well, much as I like the list(s) version, here's another more verbose way I found (but it's cool so I thought I'd add it to the fray):

>>> text = "My hovercraft is full of eels"
>>> [text[i] for i in range(len(text))]
['M', 'y', ' ', 'h', 'o', 'v', 'e', 'r', 'c', 'r', 'a', 'f', 't', ' ', 'i', 's', ' ', 'f', 'u', 'l', 'l', ' ', 'o', 'f', ' ', 'e', 'e', 'l', 's']

answered Feb 9, 2015 at 4:07

2

from itertools import chain

string = 'your string'
chain(string)

similar to list(string) but returns a generator that is lazily evaluated at point of use, so memory efficient.

How do i put all the letters in a string array in python?

answered Jul 16, 2018 at 10:19

minggliminggli

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1

string="footbar"
print([*string])

It is easy way to split a string word by word.

answered Sep 5 at 16:45

How do you put all characters of a string into a list in Python?

To convert a string to list of characters in Python, use the list() method to typecast the string into a list. The list() constructor builds a list directly from an iterable, and since the string is iterable, you can construct a list from it.

How do you create an array of letters in Python?

Use string..
alphabet_string = string. ascii_lowercase. Create a string of all lowercase letters..
alphabet_list = list(alphabet_string) Create a list of all lowercase letters..
print(alphabet_list).

How do you combine a list of letters in a string in Python?

To convert a list to a string, use Python List Comprehension and the join() function. The list comprehension will traverse the elements one by one, and the join() method will concatenate the list's elements into a new string and return it as output.

How do you store a character in an array in Python?

Like many other popular programming languages, strings in Python are arrays of bytes representing unicode characters. However, Python does not have a character data type, a single character is simply a string with a length of 1. Square brackets can be used to access elements of the string.

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