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If I understood the docs correctly, in python 2.6.5 string formatting "{0:d}" would do the same as "%d" with the String.format() way of formatting strings
" I have {0:d} dollars on me ".format(100.113) Should print "I have 100 dollars on me "
However I get the error :
ValueError: Unknown format code 'd' for object of type 'float'
The other format operations do work.for eg.
>>> "{0:e}".format(112121.2111) '1.121212e+05' 
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The format() method formats the specified value(s) and insert them inside the string's placeholder. The placeholder is defined using curly brackets: {}. Read more about the placeholders in the Placeholder section below. The format() method returns the formatted string.
The %d operator is used as a placeholder to specify integer values, decimals or numbers. It allows us to print numbers within strings or other values. The %d operator is put where the integer is to be specified. Floating-point numbers are converted automatically to decimal values.
A format of . 2f (note the f ) means to display the number with two digits after the decimal point. So the number 1 would display as 1.00 and the number 1.5555 would display as 1.56 .
Answer. In Python, string formatters are essentially placeholders that let us pass in different values into some formatted string. The %d formatter is used to input decimal values, or whole numbers. If you provide a float value, it will convert it to a whole number, by truncating the values after the decimal point.
That error is signifying that you are passing a float to the format code expecting an integer. Use {0:f} instead. Thus:
"I have {0:f} dollars on me".format(100.113) will give:
'I have 100.113000 dollars on me' Yes, you understand correctly. However you are passing float (i.e. 100.113), not int. Either convert it to int: int(100.113) or just pass 100.
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