CODEWITHSUNDEEP
python
user18963342
user18963342

Reputation: 3

how to put a variable in string method?

import math

myPi = math.pi

print('Pi rounded to {0} decimal places is {1:.2f}.'.format(2, myPi))

I am trying to modify this code by switching the .2f part by using the input function.

If I say that x=int(input("put in an integer")) and I want to change the '2' in the '.2f' part to x.. how can I do it?

Sorry for my bad description. I didn't learn python in English so it is hard for me to describe.

Upvotes: 0

Views: 71

Answers (3)

Tom Aarsen
Tom Aarsen

Reputation: 1200

You can easily use f-string formatting for this, which is generally considered the best type of string formatting:

import math
myPi = math.pi
decimals = int(input("How many decimals?"))
print(f'Pi rounded to {decimals} decimal places is {myPi:.{decimals}f}.')

That way, you can place the variablenames directly into the string. Note the f before the string. As you can see, you can use {myPi:.{decimals}f} to specify both the value and the number of decimals with f-string formatting.

Upvotes: 0

snehal gugale
snehal gugale

Reputation: 156

Try following code.

import math

myPi = math.pi

x=int(input("put in an integer"))

print('Pi rounded to {0} decimal places is {1:.{2}f}.'.format(x, myPi,x))

Upvotes: 1

Wasikur Rahman
Wasikur Rahman

Reputation: 64

You can use the round() function.

import math

myPi = math.pi
x = int(input("put in an integer: "))
print(f"Pi rounded to {x} decimal place is {round(myPi,x)}")

Upvotes: 0

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