While loop help
I'm new to learning python and creating a basic program to convert units of
measurement which I will eventually expand upon but im trying to figure out how
to loop the entire program. When I insert a while loop it only loops the first
2 lines. Can someone provide a detailed beginner friendly explanation. Here is
my program.
#!/usr/bin/env python
restart = "true"
while restart == "true":
#Program starts here
print "To start the Unit Converter please type the number next to the
conversion you would like to perform"
choice = input("\n1:Inches to Meter\n2:Millileters to Pint\n3:Acres to
Square-Miles\n")
#If user enters 1:Program converts inches to meters
if choice == 1:
number = int(raw_input("\n\nType the amount in Inches you would like to
convert to Meters.\n"))
operation = "Inches to Meters"
calc = round(number * .0254, 2)
print "\n",number,"Inches =",calc,"Meters"
restart = raw_input("If you would like to perform another conversion
type: true\n"
#If user enters 2:Program converts millimeters to pints
elif choice == 2:
number = int(raw_input("\n\nType the amount in Milliliters you would
like to convert to Pints.\n"))
operation = "Milliliters to Pints"
calc = round(number * 0.0021134,2)
print "\n",number,"Milliliters =",calc,"Pints"
restart = raw_input("If you would like to perform another conversion
type: true\n")
#If user enter 3:Program converts kilometers to miles
elif choice == 3:
number = int(raw_input("\n\nType the amount in Kilometers you would
like to convert to Miles.\n"))
operation = "Kilometers to Miles"
calc = round(number * 0.62137,2)
print "\n",number,"Kilometers =",calc,"Miles"
restart = raw_input("If you would like to perform another conversion
type: true\n")
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Re: While loop help
Also I'm getting a invalid syntax next to my elif statements that i wasnt getting before. why is this happening now? -- http://mail.python.org/mailman/listinfo/python-list
Re: While loop help
On Tuesday, April 9, 2013 9:32:18 AM UTC-4, [email protected] wrote: > I'm new to learning python and creating a basic program to convert units of > measurement which I will eventually expand upon but im trying to figure out > how to loop the entire program. When I insert a while loop it only loops the > first 2 lines. Can someone provide a detailed beginner friendly explanation. > Here is my program. Also suddenly I'm getting an invalid syntax error next to > my elif statements when I wasn't a minute ago. What is wrong here? > > > > #!/usr/bin/env python > > restart = "true" > > while restart == "true": > > #Program starts here > > print "To start the Unit Converter please type the number next to the > conversion you would like to perform" > > choice = input("\n1:Inches to Meter\n2:Millileters to Pint\n3:Acres to > Square-Miles\n") > > > > #If user enters 1:Program converts inches to meters > > if choice == 1: > > number = int(raw_input("\n\nType the amount in Inches you would like > to convert to Meters.\n")) > > operation = "Inches to Meters" > > calc = round(number * .0254, 2) > > print "\n",number,"Inches =",calc,"Meters" > > restart = raw_input("If you would like to perform another conversion > type: true\n" > > > > #If user enters 2:Program converts millimeters to pints > > elif choice == 2: > > number = int(raw_input("\n\nType the amount in Milliliters you would > like to convert to Pints.\n")) > > operation = "Milliliters to Pints" > > calc = round(number * 0.0021134,2) > > print "\n",number,"Milliliters =",calc,"Pints" > > restart = raw_input("If you would like to perform another conversion > type: true\n") > > > > #If user enter 3:Program converts kilometers to miles > > elif choice == 3: > > number = int(raw_input("\n\nType the amount in Kilometers you would > like to convert to Miles.\n")) > > operation = "Kilometers to Miles" > > calc = round(number * 0.62137,2) > > print "\n",number,"Kilometers =",calc,"Miles" > > restart = raw_input("If you would like to perform another conversion > type: true\n") -- http://mail.python.org/mailman/listinfo/python-list
Re: While loop help
Sorry I'm just starting to learn python and I'm not sure what version I'm using
to be quite honest. I just started typing it up in Komodo edit (Which I'm not
personally a fan in particular) I fixed the missing parenthesis which fixed the
invalid syntax problem. Also, I apologize for submitting code that did not run.
This is the code I have now before I tried looping it again:
#!/usr/bin/env python
#Program starts here
print "To start the Unit Converter please type the number next to the
conversion you would like to perform"
choice = raw_input("\n1:Inches to Meter\n2:Millileters to Pint\n3:Acres to
Square-Miles\n")
#If user enters 1:Program converts inches to meters
if choice == 1:
#operation = "Inches to Meters"
number = int(raw_input("\n\nType the amount in Inches you would like to
convert to Meters.\n"))
calc = round(number * .0254, 2)
print "\n",number,"Inches =",calc,"Meters"
restart = raw_input("If you would like to perform another conversion type:
true\n")
#If user enters 2:Program converts millimeters to pints
elif choice == 2:
#operation = "Milliliters to Pints"
number = int(raw_input("\n\nType the amount in Milliliters you would like
to convert to Pints.\n"))
calc = round(number * 0.0021134,2)
print "\n",number,"Milliliters =",calc,"Pints"
restart = raw_input("If you would like to perform another conversion type:
true\n")
#If user enter 3:Program converts kilometers to miles
elif choice == 3:
#operation = "Kilometers to Miles"
number = int(raw_input("\n\nType the amount in Kilometers you would like to
convert to Miles.\n"))
calc = round(number * 0.62137,2)
print "\n",number,"Kilometers =",calc,"Miles"
restart = raw_input("If you would like to perform another conversion type:
true\n")
Not sure what you meant to exactly by this:
"There's a lot of duplicated code here, most notably your continuation
condition. You can simply back-tab after the elif block and have some
code that reunites all the branches; this would also make things
clearer"
Thanks for your reply and if you have any ideas for me to improve my coding
that will prevent me from learning python in a sloppy way. I'd like to learn it
correctly the first time!
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Re: While loop help
For system version I get this:
2.7.2 (default, Oct 11 2012, 20:14:37)
[GCC 4.2.1 Compatible Apple Clang 4.0 (tags/Apple/clang-418.0.60)]
Also, I understand what your saying about the continuation code. There's no
need for me to include it in each if/else statement, I could just use it at the
end of the program outside of the statements and it would run no matter what.
But, what I don't understand exactly is the while statement. I've been looking
around a lot lately and notice that people say to use for instance:
while restart: or while true: or while restart = true:
What makes a statement true? Is there a way to return a true or false message.
My method was to ask the user to type "true" and if that print statement
matched restart = "true" then the loop would continue but i imagine there is a
better way then matching strings and integers like i have been.
Also what confuses me is that python doesn't use brackets. How do I contain all
of my if/else statements into one while loop? Do I have to indent each line of
code and extra indentation? I'm used to highschool doing c++ and java when I
would just say:
while (x<3)
{
if ()
else ()
}
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Re: While loop help
So what would be the proper way to perform a loop of this program. I still can't quite figure out the best way to do it. -- http://mail.python.org/mailman/listinfo/python-list
Re: While loop help
I responded before I saw this message, this was very helpful so I appreciate your quick and helpful responses. So do you think prompting for a string and then checking if the string is true is a good practice for something like this? When would checking for true/false be necessary? -- http://mail.python.org/mailman/listinfo/python-list
Re: While loop help
sorry i just started using google groups, not really all that sure how to use it properly. -- http://mail.python.org/mailman/listinfo/python-list
