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调研 --> 调用?
+= 调用的是 __iadd__, link: https://docs.python.org/3.4/library/operator.html#operator.iadd
mylist = ['abc123', 'def456', 'ghi789','ghi123']
sub = ['123','456']
new_list = []
for my_str in mylist:
for sub_str in sub:
if sub_str in my_str:
new_list.append(my_str)
print new_list
print [j for i in range(5) for j in range(i)]
print [my_str for my_str in mylist for sub_str in sub if sub_str in my_str]