How to find out if a Python object is a string?

stackoverflow.com › questions › 1303243 › how-to-find-out-if-a-python-object-is-a-string

Python 2

Use isinstance(obj, basestring) for an object-to-test obj.

Docs.

Answer from John Fouhy on Stack Overflow

stackoverflow.com › questions › 1303243 › how-to-find-out-if-a-python-object-is-a-string

How to find out if a Python object is a string? - Stack Overflow

Python 2

Use isinstance(obj, basestring) for an object-to-test obj.

Docs.

Python 3

In Python 3.x basestring is not available anymore, as str is the sole string type (with the semantics of Python 2.x's unicode).

So the check in Python 3.x is just:

isinstance(obj_to_test, str)

This follows the fix of the official 2to3 conversion tool: converting basestring to str.

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geeksforgeeks.org › python › check-if-a-variable-is-string-python

How to Check if a Variable is a String - Python - GeeksforGeeks

This follows Python’s “try it and see” style and also called duck typing. ... Explanation: This code attempts to call the lower() method on a. If a is a string, the method will work, and it prints "Yes". If a does not have a lower() method (e.g., it's not a string), it raises an AttributeError, and the code prints "No". This way uses regular expressions to check if the variable is a string and optionally matches a specific pattern.

Published July 11, 2025

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w3schools.com › python › gloss_python_check_string.asp

Python Check In String

Remove List Duplicates Reverse ... ... To check if a certain phrase or character is present in a string, we can use the keywords in or not in....

reddit.com › r/learnpython › how can you check if a string contains any one character from a set of characters?

r/learnpython on Reddit: How can you check if a string contains any one character from a set of characters?

May 24, 2022 -

Is there some easy, built-in way to check if a given string contains at least one single digit, 0-9? Everything I'm searching talks about the in operator or the find method, but those seem to require that you already know which digit you are looking for.

I'm leaning toward using an RE, but I wanted to know if there was a simpler way first.

Examples that would evaluate to true would be:

'44 a b'
'aa ba 5'
'45 187'

and false would be any string without at least one digit.

I figure I can just try to match it with \d+, but I don't want to rely on REs too much, even though I find them fun!

Thanks!

There's str.isdigit() checking if a string contains digits only: >>> '44 a b'.isdigit() False >>> Combined with any, applied to each character: >>> any([c.isdigit() for c in "44 a b"]) True >>>

Returns True if there is a digit and False if no digit: >>> not set('44 a a b').isdisjoint('1234567890') True >>> not set('testing').isdisjoint('1234567890') False >>> or >>> bool(set('3 a a b') & set('1234567890')) True >>> bool(set('testing') & set('1234567890')) False >>>

reddit.com › r/learnpython › is there a way to check if a string is a number?

r/learnpython on Reddit: Is there a way to check if a string is a number?

August 9, 2024 -

Basically the title, is there any way to check if a string wiuld be able to be converted to a float without causing an error? Have a python program that involves inserting a lot of numbers in sucession and I would like to not have to start again every time I accidentally make a typo

value = input() try: float(value) except ValueError: #somethin else: #something

Nobody mentioned str.isnumeric()...

sentry.io › sentry answers › python › check if a string is empty in python

Python Truth Value Testing for Empty String Checks | Sentry

2 weeks ago - Check if a Python string is empty using truth value testing with the not operator, strict comparison with == "", or strip() to handle whitespace-only strings

bottega.devcamp.com › full-stack-development-javascript-python › guide › how-to-check-value-included-python-string-list

How to Check if a Value is Included in a Python String or List

And one of my favorite parts is because this does read just like you would say it where you check to see is this in nums and then it will return either true or false. So that is how you can work with the in membership operator in Python. sentence = 'The quick brown fox jumped over the lazy Dog' word = 'dog' if word.lower() in sentence.lower(): print('The word is in the sentence') else: print('The word is not in the sentence') nums = [1, 2, 3, 4] if 3 in nums: print('The number was found') else: print('The number was not found')

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geeksforgeeks.org › python › python-check-if-given-string-is-numeric-or-not

Python Check If String is Number - GeeksforGeeks

July 11, 2025 - The final result is printed as "The string is not Number," since 'g' is a non-numeric character in the string. ... # Python code to check if string is numeric or not # checking for numeric characters numerics="0123456789" string="012gfg345" is_number = True for i in string: if i not in numerics: is_number = False break if is_number: print("The string is Number,") else: print("The string is not Number,")

geeksforgeeks.org › python › python-test-if-string-contains-element-from-list

Python - Test if string contains element from list - GeeksforGeeks

July 11, 2025 - The loop iterates through each element in the list 'el' and checks if it exists in the string 's' using the 'in' operator. If a match is found, the loop exits early using break, which saves unnecessary iterations. Using set intersection method is effective when both the string and the list of elements are relatively short. ... s = "Python is powerful and versatile." el = ["powerful", "versatile", "fast"] # Split the string into individual words using the split() method' res = bool(set(s.split()) & set(el)) print(res)

digitalocean.com › community › tutorials › python-check-if-string-contains-another-string

How To Check If a String Contains Another String in Python | DigitalOcean

April 9, 2026 - You can use the in operator, the find() method, or regular expressions to check if a string contains a substring in Python. The in operator returns True if the substring is found, while the find() method returns the index of the first occurrence of the substring, or -1 if it’s not found.

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stackabuse.com › python-check-if-variable-is-a-string

Python: Check if Variable is a String

March 2, 2021 - user_name = "John Doe" # Checks if variable is a string if (type(user_name)) is str: print("User's name is a string") else: print("User's name is not a string")

Python documentation

docs.python.org › 3 › library › functions.html

Built-in Functions — Python 3.14.6 documentation

Bytes objects can also be created with literals, see String and Bytes literals. See also Binary Sequence Types — bytes, bytearray, memoryview, Bytes Objects, and Bytes and Bytearray Operations. ... Return True if the object argument appears callable, False if not.

geeksforgeeks.org › python › python-check-if-string-contains-character

Check if string contains character - Python - GeeksforGeeks

July 23, 2025 - in operator is the easiest way to check if a character exists in a string. It returns True if the character is found and False if it is not. Python · s = "hello" if "e" in s: print("Character found!") else: print("Character not found!") Output ...

quora.com › How-do-you-check-if-a-variable-is-a-string-in-Python-3

How to check if a variable is a string in Python 3 - Quora

Answer (1 of 7): It would be much better to phrase this more precisely. Python does not, technically, have variables in the conventional sense of the term. But even with other languages you don’t say that a variable IS a string. You can say that the type of a variable is a string.

reddit.com › r/learnpython › how to check if a string contains a character in a list

r/learnpython on Reddit: How to check if a string contains a character in a list

February 19, 2022 -

I'm really new to python and i'm having some trouble figuring out how to check if a list contains a certain character.

For example:
list = ['a1', 'a2', 'b1', 'b2', 'a3', 'a5', 'c3']

how would I check to see what elements contain the string 'a'? sorry if i didn't word my question properly i'm still very new to coding, but any help would be appreciated.

Use a loop , iterate through the list, check for existence of the character .

mighty correct hospital straight glorious office fade degree library touch This post was mass deleted and anonymized with Redact

realpython.com › python-string-contains-substring

How to Check if a Python String Contains a Substring – Real Python

December 1, 2024 - This is the recommended method for confirming the presence of a substring within a string. The in operator is intuitive and readable, making it a straightforward way to evaluate substring existence. By the end of this tutorial, you’ll understand that: The in membership operator is the recommended way to check if a Python string contains a substring.

note.nkmk.me › home › python

String Comparison in Python (Exact/Partial Match, etc.) | note.nkmk.me

April 29, 2025 - Extract a substring from a string in Python (position, regex) Use re.fullmatch() to check whether the entire string matches a regular expression pattern. If the string does not completely match the pattern, None is returned.

betterstack.com › community › questions › how-to-check-if-string-represents-number-in-python

How do I check if a string represents a number in Python? | Better Stack Community

February 3, 2023 - For example: string = "" if len(string) == 0: print("The string is empty") You can also use the not operator to check if... ... To get a substring of a string in Python, you can use the string slicing notation, which is string[start:end], where ...

tutorialspoint.com › article › how-to-check-if-type-of-a-variable-is-string-in-python

How to check if type of a variable is string in Python?

March 24, 2026 - Output: Error: Expected string, got int Input: None ? Output: Error: Expected string, got NoneType Input: Python ? Output: PYTHON · Use isinstance(variable, str) for checking string types as it's the recommended approach in Python.