sum = 0.0 先定义sun是带浮点的数，0.0+任何数就=xx.0。
for x in L 让x在L集里序列循环
新的sum = 0.0 + x循环出来的数
最后/4个，得出平均。
for x in L 让x在L集里序列循环
新的sum = 0.0 + x循环出来的数
最后/4个，得出平均。
2016-11-02
已采纳回答 / Lika_zhang
def firstCharUpper(s): return s[0].upper() + s[1:]print firstCharUpper('hello')print firstCharUpper('sunday')print firstCharUpper('september')
2016-11-02
x1 = 1
d = 3
n = 100
x100 =x1+(n-1)*d
s =n*x1+n*(n-x1)*d/2
print s
d = 3
n = 100
x100 =x1+(n-1)*d
s =n*x1+n*(n-x1)*d/2
print s
2016-11-02
已采纳回答 / LUXIN66
定义0，none , false 是逻辑false, 除此以外都是true，'abc' 是字符串常量，123整数常量，都为true，123可以不加引号
2016-11-02
def square_of_sum(L):
for i in range (0,len(L)):
L[i]= L[i]*L[i]
return sum(L)
print square_of_sum([1, 2, 3, 4, 5])
print square_of_sum([-5, 0, 5, 15, 25])
for i in range (0,len(L)):
L[i]= L[i]*L[i]
return sum(L)
print square_of_sum([1, 2, 3, 4, 5])
print square_of_sum([-5, 0, 5, 15, 25])
2016-11-02
