Python Trailing Comma After Print Executes Next Instruction

If a trailing comma is added to the end of a print statement, the next statement is executed first. Why is this? For example, this executes 10000 ** 10000 before it prints 'Hi ': p

Solution 1:

1. In Python 2.x, a trailing , in a print statement prevents a new line to be emitted.

   • In Python 3.x, use print("Hi", end="") to achieve the same effect.

2. The standard output is line-buffered. So the "Hi" won't be printed before a new line is emitted.

Solution 2:

You're seeing the effects of stdout buffering: Disable output buffering

Solution 3:

As others mention, standard out is buffered. You can try using this at points that you need the output to appear:

sys.stdout.flush()

Solution 4:

print automatically puts a newline at the end of a string. This isn’t necessarily what we want; for example, we might want to print several pieces of data separately and have them all appear on one line. To prevent the newline from being added, put a comma at the end of the print statement:

d=6
print d,
print d

Output:
6 6