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import os
for k, v in os.environ.items():
print ('%s=%s' % (k,v))
li = {'a':'b','c':'d'}
for k,v in li:
print('%s=%s' % (k,v))
Traceback (most recent call last):
File "<pyshell#9>", line 1, in <module>
for k, v in li:
ValueError: need more than 1 value to unpack
for k in li:
print(k)