A for loop is used for iterating over a sequence (that is either a list, a tuple, a dictionary, a set, or a string).
This is less like the for keyword in other programming languages, and works more like an iterator method as found in other object-orientated programming languages.
With the for loop we can execute a set of statements, once for each item in a list, tuple, set etc.
EXAMPLE:
-
fruits = ["apple", "banana" , "cherry"]
-
for x in fruits:
-
print(x)
OUTPUT :
apple
banana
cherry
The for loop does not require an indexing variable to set beforehand like we have in while loops
range() :
To loop through a set of code a specified number of times, we can use the range() function,
The range() function returns a sequence of numbers, starting from 0 by default, and increments by 1 (by default), and ends at a specified number.
EXAMPLE:
for x in range(6):
print(x)
OUTPUT:
1
2
3
4
5
Note that range(6) is not the values of 0 to 6, but the values 0 to 5.
The range() function defaults to 0 as a starting value.
However it is possible to specify the starting value by adding a parameter: range(2, 6),
which means values from 2 to 6 (but not including 6):
EXAMPLE:
Using the start parameter:
for x in range(2, 6):
print(x)
OUTPUT:
2
3
4
5
The range() function defaults to increment the sequence by 1,
however it is possible to specify the increment value by adding a third parameter: range(2, 30, 3):
EXAMPLE:
Increment the sequence with 3 (default is 1):
for x in range(2, 30, 3):
print(x)
OUTPUT:
2
5
8
11
15
18
21
24
27