初识Python_技术问答

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初识Python

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其实并不扯淡

def average(*args):
if not args:
return 0.0
return sum(args)*1.0/len(args)

print average()
print average(1, 2)
print average(1, 2, 2, 3, 4)

0 7-7 Python之定义可变参数

2018-05-09

其实并不扯淡

def greet(y='world'):
print 'Hello,',y,'.'

greet()
greet('Bart')

0 7-6 Python之定义默认参数

2018-05-09

其实并不扯淡

import math

def quadratic_equation(a, b, c):
if b*b - 4*a*c < 0:
return
else:
return (-b+ math.sqrt(b*b - 4*a*c))/(2*a),(-b - math.sqrt(b*b - 4*a*c))/(2*a)

print quadratic_equation(2, 3, 0)
print quadratic_equation(1, -6, 5)

0 7-4 Python函数之返回多值

2018-05-09

小神七水

for x in [ 10,20,30,40,50,60,70,80,90 ]:
for y in [ 0,1,2,3,4,5,6,7,8,9 ]:
if x/10 < y:
print x+y

0 5-8 Python之多重循环

2018-05-09

小神七水

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

0 5-7 Python之 continue继续循环

2018-05-09

小神七水

sum = 0
x = 1
n = 1
while True:
sum +=x
if n==20:
break
x*=2
n+=1
print sum

0 5-6 Python之 break退出循环

2018-05-09

小神七水

sum = 0
x = 1
while x<100:
if x%2!=0:
sum = sum + x
x = x+1
print sum

0 5-5 Python之 while循环

2018-05-09

学呀学编程

# -*- coding: utf-8 -*-

print ('''静夜思

床前明月光，

疑是地上霜。

举头望明月，

低头思故乡。''')

2 3-7 Python中Unicode字符串

2018-05-09

qq_獨丿愛琳_0

可以这么写么，也可以运行的L = ['Adam', 'Lisa', 'Paul', 'Bart']
L.pop(2)
L.pop()
print L

0 4-5 Python从list删除元素

2018-05-09

少林无名扫地僧

for x in [ 1,2,3,4,5,6,7,8]:
for y in [2,3,4,5,6,7,8,9]:
if x < y:
print x*10+y,
这样写，更准确

3 5-8 Python之多重循环

2018-05-09

少林无名扫地僧

sum = 0
x = 1
n = 1
while True:
sum = sum+x
x = x*2
n = n+1
if n>20:
break
print sum

1 5-6 Python之 break退出循环

2018-05-09

其实并不扯淡

x1 = 1
d = 3
n = 100
x100 = 100*x1+(100*(100-1)*3/2)
s = x100
print s

0 3-4 Python中什么是变量

2018-05-09

2Fling

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

sum = 0.0
for k, v in d.iteritems():
sum = sum + v
print k,':',v
print 'average', ':', sum/len(d)

0 9-4 迭代dict的key和value

2018-05-09