已采纳回答 / 努力提升
s = 1就是把1赋值给s，例如你调用这个函数的时候num = power(2, 5):这个 n = n - 1;就是先n- 1再赋值给左边所以n = 4s = s * x;就是先s*x再赋值给左边所以s = 2
2015-12-31
def average(*args):
s = sum(args)*1.0
return 0.0 if len(args)==0 else s/len(args)
print average()
print average(1, 2)
print average(1, 2, 2, 3, 4)
s = sum(args)*1.0
return 0.0 if len(args)==0 else s/len(args)
print average()
print average(1, 2)
print average(1, 2, 2, 3, 4)
2015-12-30
最新回答 / 开心开
d={'Adam':95,'Lisa':85,'Bart':59,'Paul':74}print(d.values())s=0.0for i in d.values(): s=s+iprint(s)[85, 74, 95, 59]313.0s没有定义
2015-12-30
months = set([1])
x1 = 'Feb'
x2 = 'Sun'
if x1 not in months:
print 'x1: ok'
else:
print 'x1: error'
if x2 in months:
print 'x2: ok'
else:
print 'x2: error'
x1 = 'Feb'
x2 = 'Sun'
if x1 not in months:
print 'x1: ok'
else:
print 'x1: error'
if x2 in months:
print 'x2: ok'
else:
print 'x2: error'
2015-12-30
# -*- coding: utf-8 -*-
d = {'Adam': 95,'Lisa': 85,'Bart': 59}
if input_score not in d.values():
print '未找到!'
else:
for name, score in d.items():
if score == input_score:
print name
d = {'Adam': 95,'Lisa': 85,'Bart': 59}
if input_score not in d.values():
print '未找到!'
else:
for name, score in d.items():
if score == input_score:
print name
2015-12-30
已采纳回答 / 小明在努力
不造你不懂的是哪里 默认参数在没有传值的情况下 使用的已定义的参数假如使用的时候只传入非默认的参数 (通常的做法) 默认的就使用默认的 这个时候默认参数定义在前边就必须写出来定义在后边就不用写出来 如int()函数 通常使用 传入一个(一共两个)参数: int(2.0) 得2 参数定义int(a,b=10)但是如果定义为 int(b=10,a)的话 int(2.0)就必须写成int(10,2.0)
2015-12-30
d = {
'Adam': 95,
'Lisa': 85,
'Bart': 59
}
for (key, value) in d.items():
print("%s: %s" % (key, value))
'Adam': 95,
'Lisa': 85,
'Bart': 59
}
for (key, value) in d.items():
print("%s: %s" % (key, value))
2015-12-30
sum = 0
x = 0
while True:
x = x + 1
if x > 100:
break
if x % 2 == 0:
continue
sum += x
print sum
x = 0
while True:
x = x + 1
if x > 100:
break
if x % 2 == 0:
continue
sum += x
print sum
2015-12-30
sum = 0
x = 1
n = 1
while True:
if n <= 20:
sum += x
x *= 2
else:
break
n += 1
print sum
x = 1
n = 1
while True:
if n <= 20:
sum += x
x *= 2
else:
break
n += 1
print sum
2015-12-30