How To Use Python String Isidentifier() Method

In this tutorial, we’ll learn what Python string isidentifier() method is and how to properly use it. We’ll go through multiple Python code examples to understand how isidentifier() method works.

Outline

Introduction: Python String isidentifier() Method
Syntax of isidentifier() Method
Example 1: isidentifier() Method applied on a String
Example 2: isidentifier() used in If Else Condition inside Python For Loop
Example 3: isidentifier() Method Return Value
Conclusion

Introduction: Python String isidentifier() Method

This method will return True if a specified string is a valid Python identifier, or else it will return False.

Syntax of isidentifier() Method

string.isidentifier()

Python string isidentifier() method does not take any arguments.
This method returns True if the string is a valid Python identifier and will return False if its not.

Example 1: isidentifier() Method applied on a String

strVal='Pyhton'
print(strVal.isidentifier())
print('_Python'.isidentifier())

Output

True
True

The specified string is a valid identifier so Python string isidentifier method return True.

Below examples include some non-valid identifiers.

print('2Python'.isidentifier())
print('Pyth on'.isidentifier())
print('&Python'.isidentifier())
print('$Python'.isidentifier())
print('2.5Python'.isidentifier())
print('python2@&$'.isidentifier())

Output

False 
False 
False 
False 
False 
False

Example 2: isidentifier() used in If Else Condition inside Python For Loop

listStr=['Programming','2Python','Pyth on','_Python','&Python','$Python','python$']
for i in listStr:
  if i.isidentifier()==True:
    print(i+' is a valid identifier')
  else:
    print(i+' is not a valid identifier')

Output

Programming is a valid identifier 
2Python is not a valid identifier 
Pyth on is not a valid identifier 
_Python is a valid identifier 
&Python is not a valid identifier 
$Python is not a valid identifier 
python$ is not a valid identifier

Example 3: isidentifier() Method Return Value

val='PythonProgram3'
returnedVal=val.isidentifier()
print(returnedVal)

Output

True

Python string isidentifier method return True as the string is a valid identifier.

Conclusion

To conclude this tutorial, hope you now have an in-depth practical knowledge of how to properly use Python string isidentifier method. I’ll be looking forward to receive your valuable feedback on this post. Thank you for reading it.