Example 1: 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 2: range python 3
# range(start, stop, step)
# start = index to begin at (INCLUSIVE)
# stop = generate numbers up to, but not including this number (EXCLUSIVE)
# step = (can be omitted) difference between each number in the sequence
arr = [19,5,3,22,13]
# range(stop)
for i in range(len(arr)):
print(arr[i]) # prints: 19, 5, 3, 22, 13
# range(start, stop)
for i in range(2, len(arr)):
print(arr[i]) # prints: 3, 22, 13
# range(start, stop, step)
for i in range(0, len(arr), 2):
print(arr[i]) # prints: 19, 3, 13
# reverse:
for i in range(len(arr)-1, -1, -1):
print(arr[i])
Example 3: Range python iterate by 2
for i in range(0,10,2):
print(i)
Example 4: python range of array
>>> new_list = [1, 2, 3, 4, 5, 6, 7, 8, 9]
>>> print(new_list[5:9])
[6, 7, 8, 9]
Example 5: for i in range(n-1,0,-1):
# Print first 5 numbers using range function
for i in range(5):
print(i, end=', ')
# Output:
# 0, 1, 2, 3, 4,
Example 6: range parameters python
arr_data=[1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20]
user = int(input("Enter the product of numbers: "))
for i in range(0,20,1):
a = arr_data[i]
for t in range(0,20,1):
b = arr_data[t]
if (a*b) == user:
print(a,"x",b,"=",user)
else:
pass