x = 5
x?
x??
def print_info():
"""
show information
"""
print 'Hello ChinaHadoop'
print_info?
print_info??
%timeit [x for x in range(10)]
1000000 loops, best of 3: 888 ns per loop
%%time
l = []
for x in range(100000):
l.append(x)
Wall time: 33 ms