Solution Exercise 71: python program to find the minimum digits within a given string

Apr 19, 2023

Exercise 71 **

Write a Python algorithm that takes a string 's' as input and which determines the minimum digit within the string s. Example: if s = "Python3.7 is more power than Python2.7" , the algorithm must returns 2. We assume that the string s does not contain any negative number.

Solution

First method:

To solve this exercise we can do it as follow:
We use the for loop to iterates over every character in the string s.
We use the isdigit() method to checks if the character is a digit.
If the character is a digit, we appended it to the digits list as an integer.
Finally, we use the min method to find the smallest integer in the digits list. In this case, it's 2.

def min_digit(s):
    digits = []
    for c in s:
        if c.isdigit():
            digits.append(int(c))
    return min(digits)

s = "Python3.7 is more power than Python2.7"
print(min_digit(s)) # Output: 2

Second method: by using the regular expression

import re

def min_digit(s):
    The re.findall('\d', s) method returns a list of all digits in the string s.
    digits = re.findall('\d', s)

    # Now we can use the min method() to find the smallest digit in the list
    return min(digits)

s = "Python3.7 is more power than Python2.7"
print(min_digit(s)) # Output: 2

Younes Derfoufi
my-courses.net

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