What do 1_000 and 100_000 mean? [duplicate]

Answer 1

These are allowed since Python 3.6, see PEP 515 - Underscores in Numeric Literals. As stated in the PEP

The underscores have no semantic meaning, and literals are parsed as if the underscores were absent.

So they are just available for readability for large numbers, binary literals, hex addresses, etc. Some examples from the PEP:

>>> assert 10_000_000 == 10000000

>>> assert 0xCAFE_F00D == 0xCAFEF00D

>>> assert 0b_0011_1111_0100_1110 == 0b0011111101001110

Answer 2

Yes, it's the same as without the underscores. They have underscores there to act as thousand seperators, which for longer numbers can make them easier to read.

It's similar to how in writing we separate thousands with commas (or dots depending on your region):

1,000,000 # A million

Because of how that would interfere with tuple creation though:

n = 1,000,000
print(type(n))

<class 'tuple'> 

Python uses underscores instead of commas.