make enumerate python code example

Example 1: enumerate in python

languages = ['Python', 'C', 'C++', 'C#', 'Java']

#Bad way
i = 0 #counter variable
for language in languages:
    print(i, language)
    i+=1

#Good Way
for i, language in enumerate(languages):
    print(i, language)

Example 2: what is enumerate in python

df.iloc[:, np.r_[1:10, 15, 17, 50:100]]