CODEWITHSUNDEEP
pythonstringpython-3.x
sharp
sharp

Reputation: 2158

Python remove only alphabet elements from a list

I have a very messy data, I am trying to remove elements that contains alphabets or words. I am trying to capture the elements that have alphanumerical and numerical values. I tried .isalpha() but it not working. How do I remove this?

lista = ['A8817-2938-228','12421','12323-12928-A','12323-12928',
             '-','A','YDDEWE','hello','world','testing_purpose','testing purpose',
        'A8232-2938-228','N7261-8271']
lista

Tried: 

[i.isalnum() for i in lista] # gives boolean, but opposite of what I need.

Output: 

['A8817-2938-228','12421','12323-12928-A','12323-12928','-','A8232-2938-228','N7261-8271']

Thanks!

Upvotes: 0

Views: 1536

Answers (3)

Александр Мориконь
Александр Мориконь

Reputation: 799

What type your data in the list?

You can try to do this:

[str(i).isalnum() for i in lista]

Upvotes: 0

jpp
jpp

Reputation: 164623

It seems you can just test at least one character is a digit or equality with '-':

res = [i for i in lista if any(ch.isdigit() for ch in i) or i == '-']

print(res)

['A8817-2938-228', '12421', '12323-12928-A', '12323-12928',
 '-', 'A8232-2938-228', 'N7261-8271']

Upvotes: 0

iBug
iBug

Reputation: 37217

You can add conditional checks in list comprehensions, so this is what you want:

new_list = [i for i in lista if not i.isalnum()]
print(new_list)

Output:

['A8817-2938-228', '12323-12928-A', '12323-12928', '-', 'testing_purpose', 'testing purpose', 'A8232-2938-228', 'N7261-8271']

Note that isalnum won't say True if the string contains spaces or underscores. One option is to remove them before checking: (You also need to use isalpha instead of isalnum)

new_list_2 = [i for i in lista if not i.replace(" ", "").replace("_", "").isalpha()]
print(new_list_2)

Output:

['A8817-2938-228', '12421', '12323-12928-A', '12323-12928', '-', 'A8232-2938-228', 'N7261-8271']

Upvotes: 1

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