Extract Number from String in Python

I am new to Python and I have a String, I want to extract the numbers from the string. For example:

str1 = "3158 reviews"
print (re.findall('\d+', str1 ))

Output is ['4', '3']

I want to get 3158 only, as an Integer preferably, not as List.

You can filter the string by digits using str.isdigit method,

>>> int(filter(str.isdigit, str1))
3158

This code works fine. There is definitely some other problem:

>>> str1 = "3158 reviews"
>>> print (re.findall('\d+', str1 ))
['3158']

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