Multiply Only Numeric Values in Python String

Question

I am interested in multiplying all the numbers in a Python string by a variable (y) as in the following example where y = 10.

Initial Input: 
"I have 15, 7, and 350 cars, boats and bikes, respectively, in my parking lot."

Desired Output: 
"I have 150, 70, and 3500 cars, boats and bikes, respectively, in my parking lot."

I tried the following Python code, but am not getting the desired output. How can I create the desired output in Python code?

string_init = "I have 15, 7, and 350 cars, boats and bikes, respectively, in my parking lot."

string_split = string.split()
y = 10 
multiply_string = string * (y)
print(multiply_string)

Rakesh · Accepted Answer · 2020-09-01 04:23:09Z

3

You can use regex here.

Ex:

import re

s =  "I have 15, 7, and 350 cars, boats and bikes, respectively, in my parking lot."
y = 10
print(re.sub(r"(\d+)", lambda x: str(int(x.group())*y), s))
#or 
# print(re.sub(r"(\d+)", lambda x: f"{int(x.group())*y}", s))

Output:

I have 150, 70, and 3500 cars, boats and bikes, respectively, in my parking lot.

answered Sep 1, 2020 at 4:23

Rakesh

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3 Comments

flakes Over a year ago

I like this answer because it could be adapted pretty easily to handle decimals as well.

atlanticpacificsky Over a year ago

What exactly does the above regex statement mean and how does it work? Does it account for different types of punctuation, non-numerics, etc.?

Rakesh Over a year ago

(\d+) finds ints in the string. And then it is multiplied by the required number

Selcuk · Accepted Answer · 2020-09-01 04:23:12Z

2

You can use a regular expression:

import re
print(re.sub("(\d+)", "\g<1>0", string_init))

this should print:

I have 150, 70, and 3500 cars, boats and bikes, respectively, in my parking lot.

answered Sep 1, 2020 at 4:23

Selcuk

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1 Comment

atlanticpacificsky Over a year ago

What exactly does the above regex statement mean and how does it work? Does it account for different types of punctuation, non-numerics, etc.?

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