CODEWITHSUNDEEP
python
duhhunjonn
duhhunjonn

Reputation: 45535

How to change any data type into a string?

How can I change any data type into a string in Python?

Upvotes: 174

Views: 643236

Answers (10)

PythoNic
PythoNic

Reputation: 323

Be careful if you really want to "change" the data type. Like in other cases (e.g. changing the iterator in a for loop) this might bring up unexpected behaviour:

>> dct = {1:3, 2:1}
>> len(str(dct))
12
>> print(str(dct))
{1: 31, 2: 0}
>> l = ["all","colours"]
>> len(str(l))
18

Upvotes: 1

SuperNova
SuperNova

Reputation: 27466

You can use %s like below

>>> "%s" %([])
'[]'

Upvotes: 3

Madhav
Madhav

Reputation: 751

I see all answers recommend using str(object). It might fail if your object have more than ascii characters and you will see error like ordinal not in range(128). This was the case for me while I was converting list of string in language other than English

I resolved it by using unicode(object)

Upvotes: 21

Brian S
Brian S

Reputation: 5056

str is meant to produce a string representation of the object's data. If you're writing your own class and you want str to work for you, add:

def __str__(self):
    return "Some descriptive string"

print str(myObj) will call myObj.__str__().

repr is a similar method, which generally produces information on the class info. For most core library object, repr produces the class name (and sometime some class information) between angle brackets. repr will be used, for example, by just typing your object into your interactions pane, without using print or anything else.

You can define the behavior of repr for your own objects just like you can define the behavior of str:

def __repr__(self):
    return "Some descriptive string"

>>> myObj in your interactions pane, or repr(myObj), will result in myObj.__repr__()

Upvotes: 74

Apostolos
Apostolos

Reputation: 3445

Use formatting:

"%s" % (x)

Example:

x = time.ctime(); str = "%s" % (x); print str

Output: Thu Jan 11 20:40:05 2018

Upvotes: 0

Abgan
Abgan

Reputation: 3716

str(object) will do the trick.

If you want to alter the way object is stringified, define __str__(self) method for object's class. Such method has to return str or unicode object.

Upvotes: 14

Donald Miner
Donald Miner

Reputation: 39893

myvariable = 4
mystring = str(myvariable)  # '4'

also, alternatively try repr:

mystring = repr(myvariable) # '4'

This is called "conversion" in python, and is quite common.

Upvotes: 154

miku
miku

Reputation: 188014

Use the str built-in:

x = str(something)

Examples:

>>> str(1)
'1'
>>> str(1.0)
'1.0'
>>> str([])
'[]'
>>> str({})
'{}'

...

From the documentation:

Return a string containing a nicely printable representation of an object. For strings, this returns the string itself. The difference with repr(object) is that str(object) does not always attempt to return a string that is acceptable to eval(); its goal is to return a printable string. If no argument is given, returns the empty string, ''.

Upvotes: 12

Justin Ethier
Justin Ethier

Reputation: 134167

Just use str - for example:

>>> str([])
'[]'

Upvotes: 1

Philipp
Philipp

Reputation: 49802

With str(x). However, every data type can define its own string conversion, so this might not be what you want.

Upvotes: 6

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