python3 iterate through indexes
items=['baseball','basketball','football']
for index, item in enumerate(items):
print(index, item)python3 iterate through indexes
items=['baseball','basketball','football']
for index, item in enumerate(items):
print(index, item)python iterate through dictionary
a_dict = {'apple':'red', 'grass':'green', 'sky':'blue'}
for key in a_dict:
print key # for the keys
print a_dict[key] # for the valuesnamed tuple python iterate
>>> a = A(1, 2)
>>> for name, value in a._asdict().iteritems():
print name
print value
a
1
b
2
>>> for fld in a._fields:
print fld
print getattr(a, fld)
a
1
b
2python tuple iterate
You could google on "tuple unpacking". This can be used in various places in Python. The simplest is in assignment
>>> x = (1,2)
>>> a, b = x
>>> a
1
>>> b
2
In a for loop it works similarly. If each element of the iterable is a tuple, then you can specify two variables and each element in the loop will be unpacked to the two.
>>> x = [(1,2), (3,4), (5,6)]
>>> for item in x:
... print "A tuple", item
A tuple (1, 2)
A tuple (3, 4)
A tuple (5, 6)
>>> for a, b in x:
... print "First", a, "then", b
First 1 then 2
First 3 then 4
First 5 then 6
The enumerate function creates an iterable of tuples, so it can be used this way.Copyright © 2021 Codeinu
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