How to get the variable names from the string for the format() method

Question

Lets say I have this line:

\"My name is {name}\".format(name=\"qwerty\")

I know that the variable name is name and so I can f

Answer 1

You can parse the format yourself with the string.Formatter() class to list all references:

from string import Formatter

names = [fn for _, fn, _, _ in Formatter().parse(yourstring) if fn is not None]

Demo:

>>> from string import Formatter
>>> yourstring = "My name is {myname}"
>>> [fn for _, fn, _, _ in Formatter().parse(yourstring) if fn is not None]
['myname']

You could subclass Formatter to do something more fancy; the Formatter.get_field() method is called for each parsed field name, for example, so a subclass could work harder to find the right object to use.

Answer 2

Or an alternative is to use a function:

def format_string(name):
    return "My name is {name}".format(name="qwerty")

Then call it:

format_string("whatever")

Answer 3

If your data is in a dictionary (according to your edited question) then you can use the dictionary as a parameter for format.

data = {'first_name': 'Monty',
        'last_name': 'Python'}

print('Hello {first_name}'.format(**data))
print('Hello {last_name}'.format(**data))

Answer 4

You can use variable instead of name="querty"

name1="This is my name";

>>"My name is {name}".format(name=name1)

Output:

'My name is abc'

Another example ,

a=["A","B","C","D","E"]
>>> for i in a:
...     print "My name is {name}".format(name=i)

Output:

My name is A
My name is B
My name is C
My name is D
My name is E

Answer 5

def get_arg(yourstring):
    arg_list = []
    pin = False
    for ch in yourstring:
        if ch == "{":
            pin = True
        elif ch == "}":
            pin = False
            arg_list.append(text)
            text = ""
        elif pin:
            text +=ch
    return arg_list