how to check for the length of an element in a list python code example

Example 1: how to replace the last character of a string in python

sample_string = "712345677890 173445667"
# if i wanted to do:
new_string=sample_string.replace("7", r)
print new_string
#you won't get your results
#Output:
r123456rr890 1r344566r
#but i wanted it to be
712345677890 17344566r
#there are different methods of solving this problem but i use this one
new_string=sample_string [:-1] + "r" # you can make change the amount of last letters getting replaced like for example the last three letters you would change [:-1] to [:-3]
#Output:
712345677890 17344566r #yay this is it

Example 2: how to find the location of a character in a string in python

>>> myString = 'Position of a character'
>>> myString.find('s')
2
>>> myString.find('x')
-1

Example 3: python how to count all elements in a list

List = ["Elephant", "Snake", "Penguin"]

print(len(List))

#	With the 'len' function Python counts the amount of elements 
#	in a list (The length of the list).
#	In this case the output is '3' because there are 3 elements in the list.

Example 4: how to find length of list python

my_list = [1,2,3,4,5,6,7,8,9,10]

length_of_list = len(my_list)