python replace variable in string code example

Example 1: replace character in string python

>>> x = 'xpple bxnxnx cherry'
>>> a = x.replace(x,a)  # replaces x with a
'apple banana cherry'

>>> first_a = x.replace(x,a,1)  # only replaces first a
'apple bxnxnx cherry'

Example 2: python replace variable in string

plot.savefig(f'hanning{num}.pdf') # added in Python 3.6