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py/objstr: For str.format, add nested/computed fields support.

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Eg: '{:{}}'.format(123, '>20')

@pohmelie was the original author of this patch, but @dpgeorge made
significant changes to reduce code size and improve efficiency.
This commit is contained in:
pohmelie
2016-01-29 12:09:10 +03:00
committed by Damien George
parent 2bd758fe96
commit e3a29de1dc
2 changed files with 42 additions and 19 deletions
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8
tests/basics/string_format.py
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@@ -66,6 +66,14 @@ test("{:>20}", "foo")
test("{:^20}", "foo")
test("{:<20}", "foo")
# nested format specifiers
print("{:{}}".format(123, '#>10'))
print("{:{}{}{}}".format(123, '#', '>', '10'))
print("{0:{1}{2}}".format(123, '#>', '10'))
print("{text:{align}{width}}".format(text="foo", align="<", width=20))
print("{text:{align}{width}}".format(text="foo", align="^", width=10))
print("{text:{align}{width}}".format(text="foo", align=">", width=30))
print("{foo}/foo".format(foo="bar"))
print("{}".format(123, foo="bar"))
print("{}-{foo}".format(123, foo="bar"))