初识Python_技术问答

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初识Python

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慕粉4196474

感觉有时候知识点和习题讲的有点出入，做起练习题总觉得力不从心的

2 8-3 对字符串切片

2018-05-21

垂死病中惊坐起_

看了别人的笔记, 全部做成了数学题了.... 学渣看不懂公式..瑟瑟发抖

2 3-4 Python中什么是变量

2018-05-21

双鱼小容0313

def toUppers(L):
return [x.upper() for x in L if isinstance(x,str)]

print toUppers(['Hello', 'world', 101])

0 10-3 条件过滤

2018-05-21

双鱼小容0313

def firstCharUpper(s):
return s[:1].upper()+s[1:]

print firstCharUpper('hello')
print firstCharUpper('sunday')
print firstCharUpper('september')

0 8-3 对字符串切片

2018-05-21

双鱼小容0313

L = range(1, 101)

print L[:10]
print L[2::3]
print L[4:50:5]

1 8-1 对list进行切片

2018-05-21

双鱼小容0313

def average(*args):
if args:
return float(sum(args)) / len(args)
else:
return 0.0

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

3 7-7 Python之定义可变参数

2018-05-21

双鱼小容0313

import math

def quadratic_equation(a, b, c):
if (b*b-4*a*c) > 0:
x1 = (-b+math.sqrt(b*b-4*a*c))/(2*a)
x2 = (-b-math.sqrt(b*b-4*a*c))/(2*a)
return x1,x2
else:
return
print quadratic_equation(2, 3, 0)
print quadratic_equation(1, -6, 5)

1 7-4 Python函数之返回多值

2018-05-21