The following program uses {0} in a string, and I'm not sure how it works, it came up in an online tutorial about iteration for Python, and I can't seem to find anywhere explaining it.
import random
number = random.randint(1, 1000)
guesses = 0
print("I'm thinking of a number between 1 and 1000.")
while True:
guess = int(input("\nWhat do you think it is? "))
guesses += 1
if guess > number:
print("{0} is too high.".format(guess))
elif guess < number:
print("{0} is too low.".format(guess))
else:
break
print("\nCongratulations, you got it in {0} guesses!\n".format(guesses))
Thank you!
6 Answers
It's an indicator to the format method that you want it to be replaced by the first (index zero) parameter of format. (eg "2 + 2 = {0}".format(4))
It's a boon for placing same arg multiple times
print("When you multiply {0} and {1} or {0} and {2}, the result is {0}".format(0,1,2))
Isn't this nice!!!
Perform a string formatting operation. The format_string argument can contain literal text or replacement fields delimited by braces {}. Each replacement field contains either the numeric index of a positional argument, or the name of a keyword argument. Returns a copy of format_string where each replacement field is replaced with the string value of the corresponding argument.
It's a placeholder which will be replaced with the first argument to format in the result. {1} would be the second argument and so on.
See Format String Syntax for details.
That is the new python formatting style. Read up on it here.
year = int(input("Enter the year: "))
if year%4 == 0:
if year%100 == 0:
if year%400 == 0:
print("{0} Year is Leap Year".format(year))
else:
print("{0} Year is Not Leap Year".format(year))
else:
print("{0} Year is Leap Year".format(year))
else:
print("{0} Year is Not Leap Year".format(year))
here I can place the year argument in multiple lines using .format(year)
output :
> Enter the year: 1996
> 1996 Year is Leap Year
AND Another example:
name = 'sagar'
place = 'hyd'
greet = 'Good'
print("my name is {0}. I am from {1}. Hope everyone doing {2}".format(name,place,greet))
output:
> my name is sagar.
> I am from hyd. Hope everyone doing Good
OR
print("my name is {0}. I am from {1}. Hope everyone doing {2}".format('Sagar','Hyd','Good'))
Output:
> my name is sagar. I am from hyd. Hope everyone doing Good
