range and len in python code example

Example 1: len python meaning

# to get the length of a string or array, use the len() method
my_string = "Hello World"
my_list = ["apple", "banana", "orange"]

print(len(my_string)) # outputs 11
print(len(my_list)) # outputs 3

Example 2: for in range loop python

#there are two possibilities for a for loop
#first one is with a range()
#range() just generates lists after the following pattern

print(range(4))
>>> [0,1,2,3]
print(range(1,4))
>>> [1,2,3]
print(range(2,10,2))
>>> [2,4,6,8]

#and what the for does then is that it lets a variable (in my example x) cycle trough the list given after in

for x in range(2,10,2):
  print(x)
>>> 2
>>> 4
>>> 6
>>> 8

#so the code in the loop gets executed for every value in the given list after in
#you can also use for ... in for custom lists
#example 1:

list1 = [1,2,50,2]

for x in list1:
  print(x)

>>> 1
>>> 2
>>> 50
>>> 2

#example 2

list2 = ["bananas", "apples", "pears"]

for x in list2:
  print(x)

>>> "bananas"
>>> "apples"
>>> "pears"

Example 3: rfind() in python

#Python rfind() method finds a substring in in the string and returns the highest index. It means it returns the index of most righmost matched subtring of the string. It returns -1 if substring not found.