Implement string format method

[DoDaek]

python

>>> a = 'alpha'
>>> b = 'bravo'
>>> d = 'delta'
>>> origin = '{} {} charlie {}'
>>> new = origin.format(a, b, d)
>>> print(new)
alpha bravo charlie delta
>>> print(origin)
{} {} charlie {}
>>>

gpython

>>> a = 'alpha'
>>> b = 'bravo'
>>> d = 'delta'
>>> origin = '{} {} charlie {}'
>>> new = origin.format(a, b, d)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
    FIXME line of source goes here
AttributeError: "'str' has no attribute 'format'"
>>> print(new)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
    FIXME line of source goes here
NameError: "name 'new' is not defined"
>>> print(origin)
{} {} charlie {}
>>>

Attribute error occured using string.

[ncw]

Yes gpython needs this :-)

The specification of the format language is here so it is reasonably complicated to do completely.

[DoDaek]

It may take some time, but I'll work it out.
Thanks for your information 👍

[ghost]

@DoDaek
You can have a look (or use it?) here.
The function should be callable using "".format and str.format

[drew-512]

Waiting on response from @slongfield

slongfield/pyfmt#15