def f(n):
if n % 4 == 1:
return 4/n
else:
return -4/n
def pi(N):
' 计算pi的值 '
# step 1: 创建一个奇数序列: 1, 3, 5, 7, 9, ...
odds = itertools.count(1,2)
# step 2: 取该序列的前N项: 1, 3, 5, 7, 9, ..., 2*N-1.
ns = itertools.takewhile(lambda x: x<2*N, odds)
# step 3: 添加正负符号并用4除: 4/1, -4/3, 4/5, -4/7, 4/9, ...
L = list(map(f,ns))
# step 4: 求和:
pi = sum(L)
return pi
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cacaty
def f(n):
if n % 4 == 1:
return 4/n
else:
return -4/n
def pi(N):
' 计算pi的值 '
# step 1: 创建一个奇数序列: 1, 3, 5, 7, 9, ...
odds = itertools.count(1,2)
# step 2: 取该序列的前N项: 1, 3, 5, 7, 9, ..., 2*N-1.
ns = itertools.takewhile(lambda x: x<2*N, odds)
# step 3: 添加正负符号并用4除: 4/1, -4/3, 4/5, -4/7, 4/9, ...
L = list(map(f,ns))
# step 4: 求和:
pi = sum(L)
return pi