def pi(N):
' 计算pi的值 '
# step 1: 创建一个奇数序列: 1, 3, 5, 7, 9, ...
jishu = itertools.count(1,2)
# step 2: 取该序列的前N项: 1, 3, 5, 7, 9, ..., 2*N-1.
qiann = itertools.takewhile(lambda x: x <= 2*N-1,jishu)
# step 3: 添加正负符号并用4除: 4/1, -4/3, 4/5, -4/7, 4/9, ...
sum = 0
n = 1
for c in qiann:
sum += n*4/c
n *= -1
# step 4: 求和:
return sum
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SetNM
def pi(N):
' 计算pi的值 '
# step 1: 创建一个奇数序列: 1, 3, 5, 7, 9, ...
jishu = itertools.count(1,2)
# step 2: 取该序列的前N项: 1, 3, 5, 7, 9, ..., 2*N-1.
qiann = itertools.takewhile(lambda x: x <= 2*N-1,jishu)
# step 3: 添加正负符号并用4除: 4/1, -4/3, 4/5, -4/7, 4/9, ...
sum = 0
n = 1
for c in qiann:
sum += n*4/c
n *= -1
# step 4: 求和:
return sum