Convert a "camelCasing" to a "camel_casing"

Question

So I've written a code which does that but can't seem to convert this thisDoesAThing to this_does_a_thing but rather giving an output like this thisDoesA_thing So help me please This is my code:

import string
test = input("Enter your camelCasing")
loop = 1
x = string.ascii_uppercase
m = list(x)
for i in m:
  while True:
    while i in test and loop < 2:
      loop +=1
      n = i.lower()
      j = test.replace(i,"_"+n)
      print(j)

I think [this](https://stackoverflow.com/a/1176023/13124794) answers your question. — odaiwa, Oct 15 '22 at 08:35
why python2.7 tag when it looks like you use python3? Why 3 nested loops, especially the infinite `while True`? — buran, Oct 15 '22 at 08:36

score 0 · Answer 1 · answered Oct 15 '22 at 08:37

Here's the algo for you to implement. Note no nested loops are necessary

let output be an empty string

for each symbol in input

   if symbol is uppercase
       unless this is a first symbol, append '_' to the output
       convert symbol to lower case

   append symbol to the output

score 0 · Answer 2 · answered Oct 15 '22 at 08:42

This is a somewhat similar implementation of the algorithm in python suggested by @gog

test = input("Enter your camelCasing")
ans=''
for i in range(len(test)):
    if test[i].isupper():
        if i==0:
            ans+=test[i].lower()
        else:
            ans+="_"+test[i].lower()
    else:
        ans+=test[i]
        
print(ans)

Convert a "camelCasing" to a "camel_casing"

2 Answers2