-
Notifications
You must be signed in to change notification settings - Fork 0
Expand file tree
/
Copy path06func.py
More file actions
117 lines (93 loc) · 2.9 KB
/
06func.py
File metadata and controls
117 lines (93 loc) · 2.9 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
# -*- coding: utf-8 -*-
"""
Spyder Editor
This is a temporary script file.
"""
# 如果函数写在文件中 使用 from fimename import fun_name
import math
def my_abs(x):
if not isinstance(x, (int, float)):
raise TypeError('bad operand type')
if x >= 0:
return x
else:
return -x
n = my_abs(-10)
print(n)
# 返回多个值 本质是返回一个tuple
def move(x, y, step, angle=0):
nx = x + step * math.cos(angle)
ny = y - step * math.sin(angle)
return nx, ny
x, y = move(100, 100, 60, math.pi / 6)
print(x, y)
# 位置参数举例
def power(x, n):
result = 1
while n > 0:
result = result * x
n = n - 1
return result
result1 = power(10, 3)
# 默认参数
# 定义函数时可以提供默认参数值
# 调用函数时，如果有默认参数，可以不用提供参数
def enroll(name, gender, age=6, city="beijing"):
print('name', name)
print('gender', gender)
print('age', age)
print('city', city)
enroll("geyang", "man")
enroll("ligang", "women", city="tianjing", age = 15) # 提供参数位置应对应 若位置不对应，调用时应写上参数名=value
# 默认参数 指向可变对象
# 当调用提供参数时，没有问题； 不提供参数，结果累加？？
# 牢记：默认参数必须指向不可变对象
# 'NoneType' object has no attribute 'append'
def add_end(list1=None):
if list1 is None:
list1 = []
list1.append("END")
return list1
print(add_end(["geyang"]))
# 可变参数
# 定义的函数，传入的参数的个数是不确定的，可变的
# 可变参数在函数调用时自动组装为一个tuple
def addAll(*numbers):
result = 0
for element in numbers:
result += element **2
return result
print(addAll(1, 2, 3))
# 练习：位置参数、可变参数、多个返回值
def calc(name, *numbers):
sum = 0;
name = "change"
for element in numbers:
sum = sum + element ** 2
return name, sum
# 调用方式1：传入可变的参数个数
resultAsName, resultAsSum = calc("geyang", 1, 2, 3)
print("name:", resultAsName, "sum:", resultAsSum)
# 调用方式2：传入一个list
listTwo = [1, 2, 3]
print(calc("nihao", *listTwo))
# 关键字参数
# 关键字参数允许你传入可变的含参数名的参数
# 关键字参数在函数内自动组装为一个dict
def person(**kw):
# 我们可以在函数内部查看传了哪些参数
if "city" in kw:
print("city:", kw["city"])
elif "job" in kw:
print("job:", kw["job"])
else:
print("other:", kw)
person(job = "engineer", language = "java")
#person(language = "java")
# 命名关键字参数
#如果要限制关键字参数的名字， 需要使用命名关键字参数
# 调用命名关键字参数时，参数命名一致，位置一致，个数一致
def person(*, city, job):
print(city)
print(job)
person(city="geyang", job="engineer")