#Day17 – Fastest way to format strings in Python

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There are 3 ways to format strings in Python

  • Using the % operator
  • Using format()
  • Using f strings
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We have three functions

  • func1 uses the % operator
  • func2 uses format()
  • func3 uses f strings

We will use the timeit function to measure the time taken by each function

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We call each function 100 times and calculate the average time taken for the function call. The average time is stored in a list.

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Below are the comparisons of the 3 functions

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As you can see, f strings are faster as compared to format() and the % operator.

if…..else with f strings

num = 2
print(f"{num} is an {'even' if num%2 ==0 else 'odd'} number")

num = 3
print(f"{num} is an {'even' if num%2 ==0 else 'odd'} number")

Aligning strings

  • Left-aligned: {variable :> number}
  • Center-aligned: {variable :^ number}
  • Right-aligned: {variable :< number}
text = "string"
print(f'{text:>20}')
print(f'{text:^10}')
print(f'{text:<30}')

'''
OUTPUT
              string
  string  
string  
'''

Round floating points

num =  20.012345783
print(f'{num:0.3f}')

'''
OUTPUT
20.012
'''

Pad Zeroes

x = 10
print(f'{x:0}') #10
print(f'{x:02}') #10
print(f'{x:03}') #010
print(f'{x:04}') # 0010

If you want to pad n zeroes to a y digit number, it should be

print(f'{x:0n+y}')

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