smell_list.md

Warn when using join on a list of known literals. (join-literal)

a = "foo"
b = "bar"
",".join([a, b])

Will be fixed to

a = "foo"
b = "bar"
"{},{}".format(a, b)

Use "yield from" instead of yield inside of a for loop (yield-from)

seq = range(10)
for x in seq:
    yield x

Will be fixed to

seq = range(10)
yield from seq

Range len instead of enumerate (range-len)

for i in range(len(sequence)):
    a = sequence[i]
    print(a)

Will be fixed to

for i, a in enumerate(sequence):
    print(a)

Move if to iterator (filter-iterator)

for i in range(10):
    if i == 2:
        print(1)
        print(2)

Will be fixed to

for i in (x for x in range(10) if x == 2):
    print(1)
    print(2)

Flatten for-loops using nested comprehensions (nested-for)

seq_a = [0]
seq_b = range(10)
for i in seq_a:
    for j in seq_b:
        print(i, j)

Will be fixed to

seq_a = [0]
seq_b = range(10)
for i, j in ((i,j) for i in seq_a for j in seq_b):
    print(i, j)