Lists in Python - Practice 2

Range function in Python:¶

Range function in python is a list. It creates a list from the given input range.

In [1]:

for i in range(4):
    print(i)

0
1
2
3

In [2]:

for i in [0,1,2,3]:
    print(i)

0
1
2
3

Creating a list using range function.¶

Let's create a list with values from 1 to 100.

In [3]:

list_100 = list(range(1,101))
print(list_100)

[1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 100]

Range object :¶

syntax: range(start,stop,[step] . step is a jump value here. For example, let's print all the even number between 0 and 100

In [5]:

print(list(range(0,100,2)))

[0, 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, 32, 34, 36, 38, 40, 42, 44, 46, 48, 50, 52, 54, 56, 58, 60, 62, 64, 66, 68, 70, 72, 74, 76, 78, 80, 82, 84, 86, 88, 90, 92, 94, 96, 98]

Iterating list elements:¶

In [8]:

cities = ["chennai","delhi","mumbai","bangalore","hyderabad"]
for i in range(len(cities)):
    print(cities[i])
print("====another way:===")
for city in cities:
    print(city)

chennai
delhi
mumbai
bangalore
hyderabad
====another way:===
chennai
delhi
mumbai
bangalore
hyderabad

Multiple assignments:¶

In [2]:

cat = ["Mikki","white","small"]
name = cat[0]
color = cat[1]
size = cat[2]

print(name,color,size)

Mikki white small

In [3]:

#Multiple assignment way:
name,color,size = cat
print(name,color,size)

Mikki white small

Swapping two variables:¶

In [4]:

a = 10
b = 20
print("before swap:",a,b)
a,b = b,a
print("after swap ",a,b)

before swap: 10 20
after swap  20 10

In [ ]: