python_bugs - JasonWayne/personal-wiki GitHub Wiki

对str的操作

s = 'abc\001abc\001'

# false usage
s.rstrip('\001')
print s

# you should
s = s.rstrip('\001')
print s

从list中删去元素

original_list = [1, 2, 3, 4, 5]
a = original_list
b = original_list

original_list.remove(1)
print a
print original_list
# 总结：a和originallist指向同一个list，删去一个元素后，两者都改变


original_list = [x for x in original_list if x > 3]
print original_list
print a
# 总结：这里的originallist只是指向了一个新的list对象，并没有改变原来的list

a[:] = [x for x in a if x > 3]
print a
print b
# 成功改变了原来的list，达到了remove一样的效果
# 详细解释可见：<http://stackoverflow.com/questions/1207406/remove-items-from-a-list-while-iterating-in-python>中Alex Martelli的答案