X should print 19:05:45 then why is it printing 07:05:45 ?

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x should print 19:05:45 then why is it printing 07:05:45 ?

x='07:05:45'
one=x[:-6]
two=int(one)+int(12)
x.replace('one','two')
print(str(x))

What I have tried:

i have to change 07 to 19 ..any other way..??

Posted 5-Dec-20 3:51am

Member 15012793

Updated 5-Dec-20 4:56am

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OriginalGriff · Answer 1 · 2020-12-05T04:13:00

Because strings in python are immutable: once created, it can't be changed - all you can do is create a new string from the original with your changes applied.
So because replace can't alter the original string, it returns a new, modified one instead. You need to save the new one in a string variable, or it will be discarded.
In addition 'one' is a literal string, it has nothing to do with the variable called one.
So your code will try to replace the letters one with the letters two in the string x, not find any, so it returns a new string that is identical to the first, and you then throw that away anyway!

Try this:

Python

x='07:05:45'
one=x[:-6]
two=int(one)+int(12)
x = x.replace(str(one),str(two))
print(str(x))

But ... be aware that if the minutes or seconds are "07" then they will be replaced with "19" as well ...

Patrice T · Answer 2 · 2020-12-05T04:56:00

Python

two=int(one)+int(12)
# 12 is already an integer, so
two=int(one)+12

x.replace('one','two')
# 'one' and 'two' are strings when you want variables values, so
x.replace(one,two)
# is better

Note that your code is not safe against hours being same as minutes or seconds.
By the way, what happen to 19:05:45 id you add 12 hours with your code is it right or wrong?

Your code do not behave the way you expect, or you don't understand why !

There is an almost universal solution: Run your code on debugger step by step, inspect variables.
The debugger is here to show you what your code is doing and your task is to compare with what it should do.
There is no magic in the debugger, it don't know what your code is supposed to do, it don't find bugs, it just help you to by showing you what is going on. When the code don't do what is expected, you are close to a bug.
To see what your code is doing: Just set a breakpoint and see your code performing, the debugger allow you to execute lines 1 by 1 and to inspect variables as it execute.

Debugger - Wikipedia, the free encyclopedia[^]

Mastering Debugging in Visual Studio 2010 - A Beginner's Guide[^]
Basic Debugging with Visual Studio 2010 - YouTube[^]

JavaScript Debugging[^]
Chrome DevTools | Web | Google Developers[^]

27.3. pdb — The Python Debugger — Python 3.6.1 documentation[^]
Debugging in Python | Python Conquers The Universe[^]
pdb – Interactive Debugger - Python Module of the Week[^]

The debugger is here to only show you what your code is doing and your task is to compare with what it should do.

X should print 19:05:45 then why is it printing 07:05:45 ?

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