# Learning Python-Basic course: Day 7, Exercises and coding challenges⚔️

Originally published on the Dev.to platform here

Let us now today solve some more questions 😀 on while loops and for loops. 😁 We will look at 2-3 sample questions followed by exercises and a coding challenge ⚔️.

Sample questions-

1. Write a program to print Fibonacci numbers.

a=0
b=1
print('0,1,',end="")
for i in range(0,10):
   a,b=b,b+a
   print(b,end=",")

Simultaneous assignment of values Note the second last line. This is the Python syntax for simultaneous assignment. This is equivalent to using a temp variable like-

temp=a
a=b
b=b+temp

This python shortcut comes very very handy while swapping two numbers to

2. Write a program to display times table from 1-10

for i in range(1,11):
    for j in range(1,11):
        print(i,"*",j,"=",j*i)
    print()

OUTPUT-

1 * 1 = 1
1 * 2 = 2
1 * 3 = 3
1 * 4 = 4
1 * 5 = 5
1 * 6 = 6
1 * 7 = 7
1 * 8 = 8
1 * 9 = 9
1 * 10 = 10

2 * 1 = 2
2 * 2 = 4
2 * 3 = 6
2 * 4 = 8
2 * 5 = 10
2 * 6 = 12
2 * 7 = 14
2 * 8 = 16
2 * 9 = 18
2 * 10 = 20
.
.
.
. for numbers upto 10

What such a small amount of code can do in seconds took us years to learn...🤩

Exercises-

1. Modify the factorial program we did in day 4 to error check for zero and negative numbers.(using if-else) Answer

2. Write a program to give the following output. Answer

1
121
12321
1234321

3. Write a program to display perfect numbers from a range entered by a user (include 0).

Coding challenge-⚔️

1. Write a program to display terms of this infinite pattern until 50.

1, 2,2,3,3, 4,4,4,5,5,5,6,6,6, 7,7,7,7,8,8,8,8,9,9,9,9,10,10,10,10,.....

Comment your answers below. Let's see who can solve tis one. 🗡️🛡️ Beware, it is harder than it seems....😉

Answer to this question will be given in Day 9. 🤞 So stay tuned by following me for updates 👍. Please like and comment on dev.to or fork the repo. 😊

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