String Manipulation — Question 5

Question 5

Write a program that should do the following :

• prompt the user for a string
• extract all the digits from the string
• If there are digits:
  • sum the collected digits together
  • print out the original string, the digits, the sum of the digits
• If there are no digits:
  • print the original string and a message "has no digits"

Sample

• given the input : abc123
  prints abc123 has the digits 123 which sum to 6
• given the input : abcd
  prints abcd has no digits

Solution

str = input("Enter the string: ")
sum = 0
digitStr = ''
for ch in str :
    if ch.isdigit() :
        digitStr += ch
        sum += int(ch)
if not digitStr :
    print(str, "has no digits")
else :
    print(str, "has the digits", digitStr, "which sum to", sum)

Output

Enter the string: abc123
abc123 has the digits 123 which sum to 6

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Enter the string: KnowledgeBoat
KnowledgeBoat has no digits