var1 = 'ketchup'
regularprice = 12.80
discount_percentage = 0.27
finalprice = regularprice*(1-discount_percentage)
print('${:.2f} is the sale price of ketchup.'. format(finalprice))
print('${:.2f}is the sale price of' + ' ' + var1 + '.'. format(finalprice))
As shown above, I found that the second 'print' which added a variable could not display correctly. The format function didn't work.
Could anybody give me some hints? : )
The reason this is happening is operator precedence; . binds more tightly than +. To use .format() on a string made from several pieces, you would have to use brackets.
In this case, though, it's much better to use .format to put in both values:
print('${:.2f} is the sale price of {:s}.'.format(finalprice, var1))
Or, since the s format is the default:
print('${:.2f} is the sale price of {}.'.format(finalprice, var1))
If you're using a sufficiently recent version of Python, you can also use f-strings:
print(f'${finalprice:.2f} is the sale price of {var1}.')
What actually happens is:
print('${:.2f} is the sale price of ' + var1 + ('.'.format(finalprice)))
What you need is:
print(('${:.2f} is the sale price of ' + var1 + '.').format(finalprice))
Please note the parentheses.
Use that:
print('${:.2f} is the sale price of'.format(finalPrice) + varl + '.')
With your code, Python will understand that you are using format function for the third string element '.' which has nothing to format