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message = "hello %s , how are you %s, welcome %s"%("john","john","john")
What is the most pythonic way to avoid specifying "john" 3 times and instead to specify one phrase.
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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.
"f" stands for floating point. The integer (here 3) represents the number of decimals after the point. "%. 3f" will print a real number with 3 figures after the point. – Kefeng91.
Python's str. format() method of the string class allows you to do variable substitutions and value formatting. This lets you concatenate elements together within a string through positional formatting.
The %s operator is put where the string is to be specified. The number of values you want to append to a string should be equivalent to the number specified in parentheses after the % operator at the end of the string value. The following Python code illustrates the way of performing string formatting.
I wouldn't use % formatting, .format has many advantages. Also % formatting was originally planned to be removed with .format replacing it, although apparently this hasn't actually happened.
A new system for built-in string formatting operations replaces the
%string formatting operator. (However, the%operator is still supported; it will be deprecated in Python 3.1 and removed from the language at some later time.) Read PEP 3101 for the full scoop.
>>> "hello {name}, how are you {name}, welcome {name}".format(name='john')
'hello john, how are you john, welcome john'
I prefer the first way since it is explicit, but here is a reason why .format is superior over % formatting
>>> "hello {0}, how are you {0}, welcome {0}".format('john')
'hello john, how are you john, welcome john'
"hello %(name)s , how are you %(name)s, welcome %(name)s" % {"name": "john"}
'hello john, how are you john, welcome john'
This is another way to do this without using format.
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