I would like to know the function of: {} in the Python language and more specifically within the PRINT function as in this code?
Salario = int(input('Salario? '))
imposto = 27.
while imposto >0.:
imposto = input('Imposto ou (0) para sair: ')
if not imposto:
imposto = 27.
else:
imposto=float(imposto)
print("Valor Real: {0}".format(Salario-(Salario*(imposto*0.01))))
{0} means the replacement position of this placeholder by a value or variable. The idea is that it works as a mask this type of construction avoids excessive concatenations.
format() resembles the printf() function of php, where the placeholders are defined (in this case {0} , {n} ) and what will be the respective values the order of them must be respected otherwise an unexpected result / output will happen.
Example taken from documentation :
>>> print('{0} and {1}'.format('spam', 'eggs'))
spam and eggs
>>> print('{1} and {0}'.format('spam', 'eggs'))
eggs and spam
Recommended reading:
{0} will be replaced by the return of the format function. More details here link