def pi(N):
' 计算pi的值 '
# step 1: 创建一个奇数序列: 1, 3, 5, 7, 9, ...
odd_nums = itertools.count(1,2)
# step 2: 取该序列的前N项: 1, 3, 5, 7, 9, ..., 2*N-1.
odd_list = list(itertools.takewhile(lambda x : x <= 2*N-1, odd_nums))
# step 3: 添加正负符号并用4除: 4/1, -4/3, 4/5, -4/7, 4/9, ...
for i in range(N):
if i % 2 == 0:
odd_list[i] = 4/odd_list[i]
else:
odd_list[i] = -4/odd_list[i]
# step 4: 求和:
return sum(odd_list)
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Will就是Stone
def pi(N):
' 计算pi的值 '
# step 1: 创建一个奇数序列: 1, 3, 5, 7, 9, ...
odd_nums = itertools.count(1,2)
# step 2: 取该序列的前N项: 1, 3, 5, 7, 9, ..., 2*N-1.
odd_list = list(itertools.takewhile(lambda x : x <= 2*N-1, odd_nums))
# step 3: 添加正负符号并用4除: 4/1, -4/3, 4/5, -4/7, 4/9, ...
for i in range(N):
if i % 2 == 0:
odd_list[i] = 4/odd_list[i]
else:
odd_list[i] = -4/odd_list[i]
# step 4: 求和:
return sum(odd_list)