list of string check function in python?

Question

Mayank kumar Verma · Answer

Check if a variable is a string
and 
isinstance(value, str)
Check if list contains only strings
and 
all(isinstance(x, str) for x in lst)
Check if list contains any string
and 
any(isinstance(x, str) for x in lst)
Simple function
and 
def is_list_of_strings(lst): and  and return all(isinstance(x, str) for x in lst)
This answer assist by AI

Anubhav Kumar · Answer

Predefined is* string check functions in Python (the methods of
str class that return True/False).
Here’s the full list:
Common is* string methods in Python
Method
Returns True if…
str.isalnum()
All characters are alphanumeric (letters or digits).
str.isalpha()
All characters are alphabetic (letters only).
str.isascii()
All characters are ASCII (Python 3.7+).
str.isdecimal()
All characters are decimal digits (0–9 only).
str.isdigit()
All characters are digits (includes decimals, subscripts, superscripts).
str.isidentifier()
String is a valid Python identifier (e.g., variable name).
str.islower()
All cased characters are lowercase.
str.isnumeric()
All characters are numeric (includes digits, fractions, Roman numerals, etc.).
str.isprintable()
All characters are printable or the string is empty.
str.isspace()
All characters are whitespace.
str.istitle()
String is title-cased (first letter uppercase, rest lowercase).
str.isupper()
All cased characters are uppercase.
Example usage
s1 = "Python123"
print(s1.isalnum())      # True
print(s1.isalpha())      # False
print(s1.isascii())      # True
print(s1.isdecimal())    # False
print("123".isdecimal()) # True
print("Ⅷ".isnumeric())   # True (Roman numeral)
print("hello".islower()) # True
print("HELLO".isupper()) # True
print("Hello World".istitle()) # True
print("   ".isspace())   # True
print("print".isidentifier())  # True

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list of string check function in python?

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2 Answers

Check if a variable is a string

Check if list contains only strings

Check if list contains any string

Simple function

Common `is*` string methods in Python

Example usage

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Method	Returns `True` if…
`str.isalnum()`	All characters are alphanumeric (letters or digits).
`str.isalpha()`	All characters are alphabetic (letters only).
`str.isascii()`	All characters are ASCII (Python 3.7+).
`str.isdecimal()`	All characters are decimal digits (0–9 only).
`str.isdigit()`	All characters are digits (includes decimals, subscripts, superscripts).
`str.isidentifier()`	String is a valid Python identifier (e.g., variable name).
`str.islower()`	All cased characters are lowercase.
`str.isnumeric()`	All characters are numeric (includes digits, fractions, Roman numerals, etc.).
`str.isprintable()`	All characters are printable or the string is empty.
`str.isspace()`	All characters are whitespace.
`str.istitle()`	String is title-cased (first letter uppercase, rest lowercase).
`str.isupper()`	All cased characters are uppercase.