Python - Conditionals

If you have to compare data's and then display the result  conditionals are used.

if, elif, else

Ex for if

v1,v2=3,4
if v1<v2:
    print("v2 is greater")

Ex for else

v1,v2=7,4
if v1<v2:
    print("v2 is greater")
else:
    print("v1 is greater")

Ex for elif

v1,v2=7,7
if v1<v2:
    print("v2 is greater")
elif v1>v2:
    print("v1 is greater")
else:
    print("v1 is equal to v2")

Conditional expression:
Compare in one line and display

Ex:
v1, v2=5,3
ans="v1 is greater" if v1>v2 else "v2 is greater"
print(ans)

Switch Alternative

selc=dict(
          one="Fan",
          two="TV",
          three="Frdige",
          four="Microwave"         
          )

v='two'
print(selc[v])

 O/P:
TV 

If in above example v is assigned with other values than mentioned in dictionary then results in error.  Below example shows how to hide the error and display the result


selc=dict(
          one="Fan",
          two="TV",
          three="Frdige",
          four="Microwave"         
          )

v='six'
print(selc.get(v,"Wrong selection"))

O/P
Wrong selection