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Introduction to Python

  • Profound Academy

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    • float

    So far we have dealt with textual values (strings) and integer numbers (ints). Yet some applications require dealing with floating-point numbers. In python, those numbers are called floats. To read a floating-point number from the input, one can write a simple program:
    a = int(input())
b = float(input())

print(a, type(a))
print(b, type(b))
print(a + b - 1)
    In case the inputted numbers were 10 and 7.7, the program would print the following:
    10 <class 'int'>
7.7 <class 'float'>
16.7
     
    We can define floating-point numbers as regular variables:
    pi = 3.14159265359
r = 2
print(2 * pi * r)
    This program would compute the circumference of the circle on the right and would print 12.56637061436.
    notion image

    Challenge

    Given two sides of a rectangle h and w, compute and print its surface area.
    Input
    Output
    2 3
    6
    1.1 3.5
    3.85
     
    Note: You might notice that the python output for the second example is not exactly 3.85 but rather 3.8500000000000005. That’s because of the way our computers handle floating-point numbers. Watch this video to get more insights into how this magic happens:
    Video preview
    Video made by Computerphile (Floating-Point Numbers - Computerphile)
     
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