Converting fundamental part of code from C++ to Python

Question

I'm creating a pennies game, which has now already been created in C++, however I am having some trouble converting it to Python. It seems I can't figure out how to convert something such as this loop into Python.

       void penniesLeftOver(int amountOfPenniesCurrent) //Displays the amount of Pennies left to the user.
       {
         cout << "Pennies Remaining: " << amountOfPenniesCurrent; //Displays the amount of Pennies remaining.
         for (int i = 0; i < amountOfPenniesCurrent; i++)
         {
         cout << " o"; //Uses "o" to represent a Penny.
         }

      cout << "\n" << endl; //Starts a new line.
      }

The natural way in Python, Pythonic, is to just create a string, print( n*"o" ). — Cheers and hth. - Alf
– Cheers and hth. - Alf, Commented Nov 22, 2016 at 16:53

Guillaume · Accepted Answer · 2016-11-22 16:56:04Z

4

In python you can multiply a string by an int, it will create a new string which is the initial string repeated n times. And you can print() multiples things at once. Which gives:

def penniesLeftOver(amountOfPenniesCurrent):
    print("Pennies Remaining:", amountOfPenniesCurrent, " o"*amountOfPenniesCurrent)

answered Nov 22, 2016 at 16:56

Guillaume

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3 Comments

Dacnomaniac Over a year ago

Ahh, thank you. I'm extremely new to Python and forgot that you could multiply strings like this.

Guillaume Over a year ago

Welcome to Python world! You will see that there are multiple "shortcuts" like this one in Python that will save you a lot of time. But when coming from "limited" language such as C++ or Java, it takes some time getting used to such possibilities.

Cheers and hth. - Alf Over a year ago

@Guillaume: The equivalent in C++ is cout << string( n, 'o' ).

dave · Accepted Answer · 2016-11-22 16:55:24Z

0

for penny in range(amountOfPenniesCurrent):
    print(" o")

This is a for loop in Python. ("for each penny in the total number of pennies, print " o")

answered Nov 22, 2016 at 16:55

dave

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1 Comment

ForceBru Over a year ago

This will print amountOfPenniesCurrent new lines as well.

Aaron · Accepted Answer · 2016-11-22 17:04:29Z

0

while it makes more sense to modify the string beforehand so you only make one call to print there are other ways to accomplish your task.

sys.stdout.write(string) will write the variable string to stdout (buffered) and calling sys.stdout.flush() will flush that buffer to write immediately. (you can also define the buffer size)

alternatively you can use the print function's keyword argument end='' (which normally defaults to \n) to prevent a newline from being added. in python2.7 this requires calling from __future__ import print_function

>>>for i in range(10):
...    print('o', end='')
...
oooooooooo>>>
>>>for i in range(10):
...    sys.stdout.write('o')
...    sys.stdout.flush()
>>>
oooooooooo>>>

answered Nov 22, 2016 at 17:04

Aaron

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