在Python3上，是这样运行的：
print ('静夜思\n床前明月光，\n疑是地上霜。\n举头望明月，\n低头思故乡。')
print ('静夜思\n床前明月光，\n疑是地上霜。\n举头望明月，\n低头思故乡。')
2016-01-04
难道if就差一个括号吗？这个括号就这么重要吗？
for x in [ 1,2,3,4,5,6,7,8,9 ]:
for y in [ 0,1,2,3,4,5,6,7,8,9 ]:
if (x<y):
print x*10 + y
for x in [ 1,2,3,4,5,6,7,8,9 ]:
for y in [ 0,1,2,3,4,5,6,7,8,9 ]:
if (x<y):
print x*10 + y
2016-01-04
l = [str(a)+str(b)+str(c) for a in range(1,10) for b in range(0,10) for c in range(1,10) if a==c]
n = []
for i in l:
a = int(i)
n.append(a)
print n
n = []
for i in l:
a = int(i)
n.append(a)
print n
2016-01-03
def square_of_sum(L):
sum = 0
for i in L:
sum = sum + i*i
return sum
print square_of_sum([1, 2, 3, 4, 5])
print square_of_sum([-5, 0, 5, 15, 25])
sum = 0
for i in L:
sum = sum + i*i
return sum
print square_of_sum([1, 2, 3, 4, 5])
print square_of_sum([-5, 0, 5, 15, 25])
2016-01-03
已采纳回答 / Zhenyu1990
Python把0、空字符串''和None看成 False，其他数值和非空字符串都看成 True，所以a = 'python'如果按照布尔值来看，a = True。在计算 a or b 时，如果 a 是 True，则根据或运算法则，整个计算结果必定为 True，因此返回 a，因此就打印Python。
2016-01-03
最新回答 / ch3rish
[]括起来 只是表示集合。。。并没有表示list意义。。。如果你尝试对weekdays改变。。。你会发现set报错。。weekdays.append('QAQ')AttributeError: 'set' object has no attribute 'append'
2016-01-03
L = [75, 92, 59, 68]
sum = 0.0
for i in range(len(L)):
sum += L[i]
print sum / len(L)
sum = 0.0
for i in range(len(L)):
sum += L[i]
print sum / len(L)
2016-01-03
