How to replace whitespaces in A String with underscore without using replace function in python?

• In this blog we will be discussing on how to replace all occurances of whitespaces with underscore in A String in python .

• I have a string as below.

  string = 'Lets start coding in python'

• To replace the particular character like empty space of all occurrences in a String.
• loop through the characters of the string and check for the empty space.
• If found empty space at particular index replace the character by dividing into substrings and appending underscore .

• Below is the example syntax.

  string = string[:pos] + '_' + string[pos+1:]

• In the above syntax pos is the index at which we replace empty space with_`.
• Below is an example code on how to replace all occurances of whitespace with underscore.

string = 'Lets start coding in python'
for pos in range(0, len(string)):
	if(string[pos]==' '):
   		string = string[:pos] + '_' + string[pos+1:]
print(string)

Output:

Lets_start_coding_in_python