ReactCHALLENGES

1. Print function

print() is a built-in function: code Python already provides, which you run by calling it. A call is the function name followed by parentheses, and the values between the parentheses are its arguments.

Its signature is:

  • *values — any number of values, printed one after another.
  • sep — the text placed between values. Default: a space.
  • end — the text placed after the last value. Default: a newline.

Values passed by position, as in print("a", "b"), are positional arguments. sep and end are written as name=value, so they are keyword arguments. They are keyword-only: you must pass them by name (sep="-"), never as extra positional arguments.

\n is the escape sequence for a newline: it moves to the next line. This lesson goes through the pieces of print() one at a time: quotes, numbers, several values, sep, end, escaped quotes and multi-line strings. You can always inspect the function with help(print).

#01

Print your first line

Text goes inside quotes. print() shows it in the console.

Print exactly:

Output
Run your code to see the output here.
#02

Single or double quotes

Both "double" and 'single' quotes create a string. Use whichever you prefer.

Print exactly, using single quotes:

Output
Run your code to see the output here.
#03

Print numbers

Numbers don't need quotes. print(42) shows 42, while print("42") shows the same text.

Print exactly:

Output
Run your code to see the output here.
#04

Print several values

Each value inside the parentheses is an argument. Separate them with commas and print() shows them one after another, joined by a space.

Print exactly with a single print() and three positional arguments:

Output
Run your code to see the output here.
#05

Change the separator

sep is a keyword-only parameter: write it by name, after the positional values. It replaces the space printed between them.

Print exactly using three positional arguments and sep="-":

Output
Run your code to see the output here.
#06

Control the line ending

Every print() ends with a newline, so the next print() starts on a new line. end is also keyword-only and replaces that newline.

Print exactly using two print() calls and end:

Output
Run your code to see the output here.
#07

Quotes inside a string

To put a " inside a "..." string, escape it with a backslash: \".

Print exactly, using double quotes:

Output
Run your code to see the output here.
#08

Multi-line strings

Triple quotes """...""" let a string span several lines.

Print exactly:

Output
Run your code to see the output here.