[Tutor] Truth value testing in if, while and boolean operations

[Manprit Singh]

Dear sir ,

While referring to python docs , i found that under the heading "Truth
Value testing" it is written that

empty sequences and collections: '', (), [], {}, set(), range(0) are
considered as false .

In PEP8 docs under "programming recommendations" it is written that :

"For sequences, (strings, lists, tuples), use the fact that empty sequences
are false:

so it is a valid practice to write like this

if sequence:        # do_this() will be executed if sequence is not empty

    do_this()

else:              # do_this_1() will be executed if sequence is  empty

    do_this_1()

There is nothing mentioned in PEP 8 about using the sets, dicts etc in the
same way as given above . As we know that empty sets & dicts are also
considered false, using dicts and sets in the way as given above is valid
and adheres to PEP 8 guidelines ?

___________________________________________________________________

if dict:          # do_this() will be executed if dict is not empty

    do_this()

else:             # do_this_1() will be executed if dict is  empty

    do_this_1()

_____________________________________________________________________

if set:           # do_this() will be executed if set is not empty

    do_this()

else:              # do_this_1() will be executed if set is  empty

    do_this_1()

___________________________________________________________________

2 Examples just given above are valid according to PEP 8?

Regards

Manprit Singh