Some coolest things in python may be you don't know [Python part 3]

Some coolest things in python may be you don't know

Displaying Hello world in  Java!

Displaying Hello world in python

1.Swapping of numbers

In other language

a=a+b;

b=a-b;

a=a-b;

In python language:

a,b=.b,a   #swap two number without additional varible

2.Number System Conversion

print(bin(2))

print(hex(10))

Output->

0b10

0xa

3.Concept in 2 lines

a=int(input())

print(("Not Multiple of 5", "Multiple of 5")[a%5==0])

Input->

10

Output->

multiple of 5

4.Display Calender of any year

import calendar

cal = calendar.month(2017,11)

print(cal)

Output->

5. interpreter will store your last value. get it with the help of  _

>>> 2**2

4

>>> _

4

>>> 

6.Boolean takes interger value

a=[2,3,4,5]

print a[True]

print a[false]

output->

3

2

7. Reverse the list itself:

mylist = [1,2,3]

mylist.reverse()

print mylist

-> [3,2,1]

# Iterate in reverse

for element in reversed([1,2,3]): print element

-> 3

-> 2

-> 1

8.Splat call

def foo(a, b, c):

    print a, b, c

mydict = {'a':1, 'b':2, 'c':3}

mylist = [10, 20, 30]

foo(*mydict)

-> a, b, c

foo(**mydict)

-> 1, 2, 3

foo(*mylist)

-> 10 20 30

9.Chaining comparisons: Rather than write something like this:

if mark> 50 and mark <= 100:

print("You passed the exam.")

elif mark >= 0 and mark <= 50:

print("You did NOT pass the exam.")

else:

print("Error: Invalid mark")

you can just write:

if 50 < mark <= 100: # Yup, this is valid Python syntax

print("You passed the exam.")

elif 0 <= mark <= 50:

print("You did NOT pass the exam.")

else:

print("Error: Invalid mark")

Just makes the code more shorter/readable.

10. type  import this in python and run