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Python Python Sequences Sequence Iteration Iterating with Ranges

mohan Abdul
PLUS
mohan Abdul
Courses Plus Student 1,453 Points

how comes this code only iterates 9 times?

how comes this code only iterates 9 times?

for i in range(1, 10, 1):
    print(i)
Thanaphon Chavengsaksongkram
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.a{fill-rule:evenodd;}techdegree seal-36
Thanaphon Chavengsaksongkram
Front End Web Development Techdegree Graduate 13,464 Points

range function generates a list from start to end -1. The default start is 0.

range(5) = [0,1,2,3,4] <--- You get 5 iterations since it start from 0 range(1,5) = [1,2,3,4] <--- You only get 4 iterations since it start from 1

mohan Abdul
mohan Abdul
Courses Plus Student 1,453 Points

Thanaphon Chavengsaksongkram, so regardless of the start number, the iteration always starts at 0?

mohan Abdul
mohan Abdul
Courses Plus Student 1,453 Points

Thanaphon Chavengsaksongkram, Thanks for the speedy reply, unfortunately it wont let me give positive mark or best answer. Are you sure you are replying in the answer box?

1 Answer

Steven Parker
Steven Parker
231,268 Points

The "stop" argument of a range is not the last value, but the limit value. For a positive "step", the contents of a range r are determined by the formula r[i] = start + step*i where i >= 0 and r[i] < stop. Notice that comparison is less than (not "less than or equal").

For more details, see the chapter on ranges in the Python documentation.