Can I use lambda to evaluate x for user given functions??

Answer 1

yup
use eval to evaluate the given user input

f=eval(input("Enter the function: "))
# input: lambda x:x*x
print(f(8)) #outputs 64

Answer 2

print("Thanks Burey")
print("Needed that for something")

Answer 3

you mean something like this?

def sqr(x):
return x*x

f=lambda x:sqr(x)

print(f(2))

Answer 4

no problem :)
happy to help

Answer 5

nope
x=input("Enter the function: ")
y=lambda z: x
print(y(8))
something like that