Python code for converting inches to millimeters

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Python3.6

I need this code for an assignment please:

Write the algorithm and Python code to convert measurements made in inches to millimeters. The conversion is as follows: 1 inch is equivalent to 25 millimeters. The program should ask the user if they would like to convert another measurement and run again if “y” or “Y” is entered by the user. Any other entry should cause the program to terminate. Enter multi-line comments as needed and test the code.

And what I have so far is this:

#This program converts measurements made in inches to millimeters.
"""

Created By:
Date: 12/14/2017
Class: CSIT 100-41
"""

DoAgain = "Yes";

while DoAgain == "Yes" or DoAgain == "y":
print("Welcome to the Conversion Calculator")

Inches= float(input("Please enter the number of inches: "))

Total= Inches * .25

I think its wrong but idk how to fix it, please help anyone.

What I have tried:

#This program converts measurements made in inches to millimeters.
"""

Created By:
Date: 12/14/2017
Class: CSIT 100-41
"""

DoAgain = "Yes";

while DoAgain == "Yes" or DoAgain == "y":
print("Welcome to the Conversion Calculator")

Inches= float(input("Please enter the number of inches: "))

Total= Inches * .25