初识Python_技术问答

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初识Python

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san_point_water

d = { 'Adam': 95, 'Lisa': 85, 'Bart': 59, 'Paul': 74 }

sum = 0.0
for i in d.itervalues():
sum+=i

print sum/len(d.values())

1 9-3 迭代dict的value

2016-01-22

桃子入侵

s = set(['Adam', 'Lisa', 'Paul'])
L = ['Adam', 'Lisa', 'Bart', 'Paul']
for x in L:
if x in s:
s.remove(x)
else:
s.add(x)
print s

0 6-10 Python之更新set

2016-01-22

桃子入侵

s = set([('Adam', 95), ('Lisa', 85), ('Bart', 59)])
for x in s:
print x[0],':',x[1]

0 6-9 Python之遍历set

2016-01-22

桃子入侵

s = set(['Adam', 'Lisa', 'Bart', 'Paul'])
ss = set()
for a in s:
a = a.lower()
ss.add(a)
print 'adam' in ss
print 'bart' in ss

0 6-7 Python之访问set

2016-01-22

桃子入侵

for x in range(1,10):
for y in range(1,10):
if x >= y:
continue
print x*10 + y

0 5-8 Python之多重循环

2016-01-22

桃子入侵

sum = 0
x = 0
while True:
x = x + 1
if x%2 == 0:
continue
if x > 100:
break
sum = sum + x

print sum

0 5-7 Python之 continue继续循环

2016-01-22

桃子入侵

sum = 0
x = 1
n = 1
while True:
sum = sum + x
x = 2 * x
n = n + 1

if n > 20:
break
print sum

0 5-6 Python之 break退出循环

2016-01-22

我吃四碗饭

import math
def quadratic_equation(a, b, c):
data = b*b-4*a*c
if a == 0:
return -c/b
elif data == 0:
return -b/(2*a)
elif data < 0:
return none
else:
return (-b+math.sqrt(data))/(2*a),(-b-math.sqrt(data))/(2*a)
print quadratic_equation(2, 3, 0)

0 7-4 Python函数之返回多值

2016-01-22

桃子入侵

sum = 0
x = 1
while x < 100:
sum = sum + x
x = x + 2

print (sum)

0 5-5 Python之 while循环

2016-01-22

我吃四碗饭

def square_of_sum(L):
sum = 0
for i in L:
q = i*i
sum += q
return sum
print square_of_sum([1, 2, 3, 4, 5])
print square_of_sum([-5, 0, 5, 15, 25])

0 7-3 Python之编写函数

2016-01-22