1# numerical loop
2numbers = [1, 2, 3, 4]
3for num in numbers:
4 print(num)
5
6# get every character in the string
7someStr = "fire in the hole"
8for s in someStr:
9 print(s)
10
11# list loop
12carBrands = ["audi", "bmw", "mercedes", "porsche"]
13for brand in carBrands:
14 print(brand)
Range Function
The range() function returns a sequence of numbers. It starts from 0 (by default) and increments by 1 (by default) and ends at a specified number.
1# print values from 0 to 3
2for num in range(4):
3 print(num)
4
5# start with 3 and stop before 10
6for x in range(3, 10):
7 print(x)
8
9# start with 4 and stop before 20 and increment with 3
10for x in range(4, 20, 3):
11 print(x)
1# another list loop example with range()
2carBrands = ["audi", "bmw", "mercedes", "porsche"]
3for brand in range(len(carBrands)):
4 print(carBrands[brand])
Else Usage
it can be valid when the loop is finished.
1for x in range(5, 25, 4):
2 print(x)
3else:
4 print("The loop is finished")
Continue Usage
Continue to the next iteration. it goes directly to top where loop starts. so when brand is bmw then it never print this brand because print is below of continue.
1carBrands = ["audi", "bmw", "mercedes", "porsche"]
2for brand in carBrands:
3 if brand == "bmw":
4 continue
5 print(brand)
Break Usage
break can be used to stop the loop.
1carBrands = ["audi", "bmw", "mercedes", "porsche"]
2for brand in carBrands:
3 print(brand)
4 if brand == "bmw":
5 break
Nested Loop
1for x in range(2, 5):
2 for y in range(x, x*2, 2):
3 print(y)
4 print(x)
5
6str1 = ["Blue","Red","Green"]
7str2 = ["Sprinkles"]
8for s1 in str1:
9 for s2 in str2:
10 print(s1,s2)
Pass Usage
for loops cannot be empty! you can use pass statement to avoid getting an error for empty content.
1for x in ["one","two","three"]:
2 pass