for n in range(x,y) ?? - Printable Version

for n in range(x,y) ?? - Printable Version

+- Python Forum (https://python-forum.io)
+-- Forum: Python Coding (https://python-forum.io/forum-7.html)
+--- Forum: General Coding Help (https://python-forum.io/forum-8.html)
+--- Thread: for n in range(x,y) ?? (/thread-15494.html)

for n in range(x,y) ?? - MuntyScruntfundle - Jan-19-2019

Why does
>> for n in range(1,5)
give 4 iterations?

>> for n in range(0,5)
give 4 iterations?

>> for n in tange(1,6)
give 5 iterations?

Surely this makes little sense. Do I need to set a base number somewhere like you used to have to in Basic many years ago?

Thanks.

RE: for n in range(x,y) ?? - stullis - Jan-19-2019

The iterator returned by range() starts at either 0 or the start number provided. It stops when the index equals the end number.

for n in range(1,5):
    print(n)

# is equivalent to 

n = 1
while 1 <= n < 5:
    print(n)
    n += 1

range(0,5) returns five iterations from 0 through 4. A common way of returning the end number of a range is to increase the end number by 1; instead of range(0,5), use range(0,6).

RE: for n in range(x,y) ?? - DeaD_EyE - Jan-19-2019

Slicing and the range function has following rule:

Start is inclusive
Stop is exclusive