>>> int('5')
--> 5

>>> int('5.1')
---------------------------------------------------------------------------
ValueError                                Traceback (most recent call last)
<ipython-input-162-e67d7b0b70d0> in <module>()
----> 1 int('5.1')

ValueError: invalid literal for int() with base 10: '5.1'

>>> int(5.1)
--> 5

>>> int(5.9)
--> 5

>>> float('5.1')
--> 5.1

>>> float('5')
--> 5.0

>>> complex('5')
--> (5+0j)

>>> complex(3.14)
--> (3.14+0j)
