print 1/50 results to a rounded zero: 0
print float(1/50) once again returns zero but as a float.
What syntax I should be using to get a right result (0.02) using only stock modules.
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3 Answers
This line:
print float(1/50) Performs an integer division of 1/50, and then casts it to a float. This is the wrong order, since the integer division has already lost the fractional value.
You need to cast to a float first, before the division, in one of these ways:
float(1)/50 1./50 
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When you write print float(1/50), Python first calculates the value of 1/50 (ie. 0) and then converts it to a float. That's clearly not what you want.
Here are some ways to do it:
>>> print float(1)/50 0.02 >>> print 1/float(50) 0.02 >>> print float(1)/float(50) 0.02 >>> print 1./50 0.02 >>> print 1/50. 0.02 >>> print 1./50. 0.02 
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Alternatively:
>>> from __future__ import division >>> 1/50 0.02 This is on by default in Python 3
