my_var = 'mummy'. #Find the position of 'm'
#Using find - find returns the index for the first instance from the left.
my_var.find('m')
# Output: 0
#Using rfind - rfind returns the index for the first instance from the right.
my_var.rfind('m')
# Output: 3
# With find() and rfind(), when substring is not found, it returns -1.
#NB: You can use index() and rindex(). In this case, when the substring is not
# found, it raises an exception.
myString = 'Position of a character'
myString.find('s')
# 2
myString.find('x')
# -1
word = 'Hello'
to_find = 'l'
# in one line
print([i for i, x in enumerate(word) if x == to_find])