Getting approximate value for variable instead of exact value

Question

I'm getting approximate values for start variable in below code:

start = 1
end = 2
incr = 0.2
while start < end:
    print(start)
    start = start + incr

Actual output:
1
1.2
1.4
1.5999999999999999
1.7999999999999998
1.9999999999999998
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Expected output:
1
1.2
1.4
1.6
1.8

I couldn't figure out why this is happening.

Answer 1

Try this:

start = 1
end = 2
incr = 0.2
while start < end:
    print(start)
    start = round(start + incr,1)