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df = pd.DataFrame({'A': [1, 2, 3], 'B': [4, 5, 6]}, index=['a', 'b', 'c'])
# Out[75]:
#    A  B
# a  1  4
# b  2  5
# c  3  6

for col in df:
    print(col)
# A
# B
for key, column in df.iteritems():
    print(key)
    print(column)
# A
# a    1
# b    2
# c    3
# Name: A, dtype: int64
# B
# a    4
# b    5
# c    6
# Name: B, dtype: int64
for key, row in df.iterrows():
    print(key)
    print(row)
# a
# A    1
# B    4
# Name: a, dtype: int64
# b
# A    2
# B    5
# Name: b, dtype: int64
# c
# A    3
# B    6
# Name: c, dtype: int64