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Python File fileno() Method

Python File fileno() Method

Python File fileno() Method is used to return the file descriptor of the stream as a number. If the operator system does not use a file descriptor then an error will occur.

Syntax:
file.fileno()
Here is an example of Python fileno() method:

f = open("demofile.txt", "r")
print(f.fileno())

Output:
3