Extract Number from String in Python

Question

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

User · Answer

you can use the below method to extract all numbers from a string.

def extract_numbers_from_string(string):
    number = ''
    for i in string:
        try:
            number += str(int(i))
        except:
            pass
    return number

(OR) you could use i.isdigit() or i.isnumeric(in Python 3.6.5 or above)

def extract_numbers_from_string(string):
    number = ''
    for i in string:
        if i.isnumeric():
            number += str(int(i))
    return number


a = '343fdfd3'
print (extract_numbers_from_string(a))
# 3433

User · Answer

This code works fine  There is definitely some other problem    gt  gt  gt  str1    3158 reviews   gt  gt  gt  print  re findall   d    str1      3158

User · Answer

If the format is that simple  a space separates the number from the rest  then  int str1 split   0     would do it

User · Answer

Use this  THIS IS FOR EXTRACTING NUMBER FROM STRING IN GENERAL   To get all the numeric occurences   split function to convert string to list and then the list comprehension which can help us iterating through the list and is digit function helps to get the digit out of a string  getting number from string use list comprehension isdigit   test string    quot i have four ballons for 2 kids quot   print  quot The original string    quot   test string      list comprehension   isdigit    split    res    int i  for i in test string split   if i isdigit    print  quot The numbers list is    quot   str res     To extract numeric values from a string in python  Find list of all integer numbers in string separated by lower case characters using re findall expression string  method   Convert each number in form of string into decimal number and then find max of it  import re   def extractMax input      get a list of all numbers separated by lower case characters    numbers   re findall   d   input       d  is a regular expression which means one or more digit  number   map int numbers  print max numbers  if   name     quot   main   quot   input    sting  extractMax input

User · Answer

Your regex looks correct  Are you sure you haven t made a mistake with the variable names  In your code above you mixup total hotel reviews string and str     gt  gt  gt  import re  gt  gt  gt  s    3158 reviews   gt  gt  gt    gt  gt  gt  print re findall   d    s     3158

User · Answer

Best for every complex types str1    quot sg-23 0 300sdf343fc  -34rrf-3 4r quot   All kinds of occurrence of numbers between strings num    float s  for s in re findall r -  d     d    str1   print num   Output   -23 0  300 0  343 0  -34 0  -3 4

User · Answer

My answer does not require any additional libraries  and it s easy to understand  But you have to notice that if there s more than one number inside a string  my code will concatenate them together   def search number string string       index list          del index list        for i  x in enumerate string           if x isdigit      True              index list append i      start   index list 0      end   index list -1    1     number   string start end      return number

User · Answer

I am a beginner in coding  This is my attempt to answer the questions  Used Python3 7 version without importing any libraries    This code extracts and returns a decimal number from a string made of sets of characters separated by blanks  words     Attention  In case there are more than one number  it returns the last value   line   input   Please enter your string    for word in line split        try          a float word          print  a      except ValueError          pass

User · Answer

a      line    abcd 3455 ijkl 56 78 ij  for word in line split     try    a append float word     except ValueError    pass print a    OUTPUT  3455 0 56 78

User · Answer

Above solutions seem to assume integers  Here s a minor modification to allow decimals   num   float    join filter lambda d  str isdigit d  or d         inputString     Doesn t account for - sign  and assumes any period is properly placed in digit string  not just some english-language period lying around  It s not built to be indestructible  but worked for my data case

User · Answer

IntVar   int    join filter str isdigit  StringVar

User · Answer

To extract a single number from a string you can use re search    which returns the first match  or None    gt  gt  gt  import re  gt  gt  gt  string    3158 reviews   gt  gt  gt  int re search r  d    string  group 0   3158  In Python 3 6  you can also index into a match object instead of using group     gt  gt  gt  int re search r  d    string  0   3158

User · Answer

You can filter the string by digits using str isdigit method    gt  gt  gt  int filter str isdigit  str1   3158

User · Answer

There may be a little problem with code from Vishnu s answer  If there is no digits in the string it will return ValueError  Here is my suggestion avoid this    gt  gt  gt  digit   lambda x  int filter str isdigit  x  or 0   gt  gt  gt  digit  3158 reviews   3158  gt  gt  gt  digit  reviews   0

[python] Extract Number from String in Python

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