Python Program to test if the String only Numbers and Alphabets

Photo of Namachila Namachila Send an email 7 minutes ago
0 0 3 minutes read

Given a String, our task is to write a Python program to check if string contains both numbers and alphabets, not either nor punctuations.

Examples:

Input : test_str = 'Geeks4Geeks'
Output : True
Explanation : Contains both number and alphabets.

Input : test_str = 'Lazyroar'
Output : False
Explanation : Doesn't contain number.

Method #1 : Using isalpha() + isdigit() + any() + all() + isalnum()

In this, we check for all digits containing is alphabets and numbers combination using all(), isalpha() and isdigit(). The any() and isalnum() is used to filter out possibility of punctuations.

Python3




# Python3 code to demonstrate working of
# Test if string contains both Numbers and Alphabets only
# Using isalpha() + isdigit() + any() + all() + isalnum()
 
# initializing string
test_str = 'Geeks4Geeks'
 
# printing original string
print("The original string is : " + str(test_str))
 
# conditional combination for getting result.
res = not ((all(idx.isdigit() for idx in test_str) or (all(idx.isalpha()
            for idx in test_str)) or (any(not idx.isalnum() for idx in test_str))))
 
# printing result
print("Does string contain both numbers and alphabets only? : " + str(res))
 



















Output


The original string is : Geeks4Geeks
Does string contain both numbers and alphabets only? : True




Time Complexity: O(n2)
Auxiliary Space: O(n)


Method #2 : Using regex




Using regex is one of the ways in which this problem can be solved. 




Python3


















 






 




 



























# Python3 code to demonstrate working of


# Test if string contains both Numbers and Alphabets only


# Using regex


import re


 


# initializing string


test_str = 'Geeks4Geeks'


 


# printing original string


print("The original string is : " + str(test_str))


 


# conditional combination for getting result.


res = bool(re.match("^(?=.*[a-zA-Z])(?=.*[\d])[a-zA-Z\d]+$", "A530"))


         


# printing result


print("Does string contain both numbers and alphabets only? : " + str(res))










































Output


The original string is : Geeks4Geeks
Does string contain both numbers and alphabets only? : True




Time Complexity: O(n)
Auxiliary Space: O(n)


Method #3 : Using in operator




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# Python3 code to demonstrate working of


# Test if string contains both Numbers and Alphabets only


 


# initializing string


test_str = 'Geeks4Geeks'


lowercasealphabets="abcdefghijklmnopqrstuvwxyz"


uppercasealphabets="ABCDEFGHIJKLMNOPQRSTUVWXYZ"


digits="0123456789"


 


# printing original string


print("The original string is : " + str(test_str))


 


res=False


al=0


dig=0


for i in test_str:


    if (i in lowercasealphabets) or (i in uppercasealphabets):


        al+=1


    elif (i in digits) :


        dig+=1


if(al+dig==len(test_str)):


    res=True


     


# printing result


print("Does string contain both numbers and alphabets only? : " + str(res))


 


 


 


#contributed by Bhavya Koganti










































Output


The original string is : Geeks4Geeks
Does string contain both numbers and alphabets only? : True




Time Complexity: O(n)
Auxiliary Space: O(1)


Method #4 : Using replace() and len() methods




Python3


















 






 




 



























# Python3 code to demonstrate working of


# Test if string contains both Numbers and


# alphabets only


 


# Initializing string


test_str = 'Geeks4Geeks'


 


lalphabets = "abcdefghijklmnopqrstuvwxyz"


ualphabets = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"


digits = "0123456789"


 


x = lalphabets+ualphabets+digits


 


# Printing original string


print("The original string is : " + str(test_str))


 


for i in x:


    test_str = test_str.replace(i, "")


res = False


if(len(test_str) == 0):


    res = True


 


# Printing result


print("Does string contain both numbers and alphabets only? : " + str(res))










































Output




The original string is : Geeks4Geeks
Does string contain both numbers and alphabets only? : True




Time Complexity: O(n)
Auxiliary Space: O(n)
 


Method #5: Using operator.countOf() method




Python3


















 






 




 



























# Python3 code to demonstrate working of


# Test if string contains both Numbers and Alphabets only


import operator as op


# initializing string


test_str = 'Geeks4Geeks'


lowercasealphabets="abcdefghijklmnopqrstuvwxyz"


uppercasealphabets="ABCDEFGHIJKLMNOPQRSTUVWXYZ"


digits="0123456789"


 


# printing original string


print("The original string is : " + str(test_str))


 


res=False


al=0


dig=0


for i in test_str:


    if ( op.countOf(lowercasealphabets.split(),i)>0) or (op.countOf(uppercasealphabets.split(),i)>0):


        al+=1


    elif (op.countOf(digits.split(),i)>0) :


        dig+=1


if(al+dig==len(test_str)):


    res=True


     


# printing result


print("Does string contain both numbers and alphabets only? : " + str(res))










































Output


The original string is : Geeks4Geeks
Does string contain both numbers and alphabets only? : False




Time Complexity: O(n)
Auxiliary Space: O(1)


Method #6:Using itertools.filterfalse() method




Python3


















 






 




 



























# Python3 code to demonstrate working of


# Test if string contains both Numbers and Alphabets only


import itertools


 


# initializing string


test_str = 'Geeks4Geeks'


 


# printing original string


print("The original string is : " + str(test_str))


 


# conditional combination for getting result.


res = list(itertools.filterfalse(


    lambda x: (x.isdigit() or x.isalpha()), test_str))


if(res):


    res = False


res = True


# printing result


print("Does string contain both numbers and alphabets only? : " + str(res))










































Output


The original string is : Geeks4Geeks
Does string contain both numbers and alphabets only? : True




Time Complexity: O(n)
Auxiliary Space: O(N)






			
		


				

			

				

						
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