M o n t y P y t h o n

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s = 'Monty Python'
print (s[0:4])

it prints the word until 3, where near 3 is 4 (0,1,2,3)

Mont

s = 'Monty Python'
print (s[6:7])

it prints letter,

P

s = 'Monty Python'
print (s[:6])

prints the word,

Monty

greeting = 'Hey man!'
new_greeting = 'g' + greeting[1:]
print(new_greeting)

prints,

gey man!