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nop函数Python nop函数头文件

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Python的函数参数总结import math
a = abs
print(a(-1))
n1 = 255
print(str(hex(n1)))
def my_abs(x):
# 增加了参数的检查
if not isinstance(x, (int, float)):
raise TypeError('bad operand type')
if x = 0:
return x
else:
return -x
print(my_abs(-3))
def nop():
pass
if n1 = 255:
pass
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)
tup = move(100, 100, 60, math.pi / 6)
print(tup)
print(isinstance(tup, tuple))
def quadratic(a, b, c):
k = b * b - 4 * a * c
# print(k)
# print(math.sqrt(k))
if k0:
print('This is no result!')
【nop函数Python nop函数头文件】return None
elif k == 0:
x1 = -(b / 2 * a)
x2 = x1
return x1, x2
else:
x1 = (-b + math.sqrt(k)) / (2 * a)
x2 = (-b - math.sqrt(k)) / (2 * a)
return x1, x2
print(quadratic(2, 3, 1))
def power(x, n=2):
s = 1
while n0:
n = n - 1
s = s * x
return s
print(power(2))
print(power(2, 3))
def enroll(name, gender, age=8, city='BeiJing'):
print('name:', name)
print('gender:', gender)
print('age:', age)
print('city:', city)
enroll('elder', 'F')
enroll('android', 'B', 9)
enroll('pythone', '6', city='AnShan')
def add_end(L=[]):
L.append('end')
return L
print(add_end())
print(add_end())
print(add_end())
def add_end_none(L=None):
if L is None:
L = []
L.append('END')
return L
print(add_end_none())
print(add_end_none())
print(add_end_none())
def calc(*nums):
sum = 0
for n in nums:
sum = sum + n * n
return sum
print(calc(1, 2, 3))
print(calc())
l = [1, 2, 3, 4]
print(calc(*l))
def foo(x, y):
print('x is %s' % x)
print('y is %s' % y)
foo(1, 2)
foo(y=1, x=2)
def person(name, age, **kv):
print('name:', name, 'age:', age, 'other:', kv)
person('Elder', '8')
person('Android', '9', city='BeiJing', Edu='人民大学')
extra = {'city': 'Beijing', 'job': 'Engineer'}
person('Jack', 24, **extra)
def person2(name, age, *, city, job):
print(name, age, city, job)
person2('Pthon', 8, city='BeiJing', job='Android Engineer')
def person3(name, age, *other, city='BeiJing', job='Android Engineer'):
print(name, age, other, city, job)
person3('Php', 18, 'test', 1, 2, 3)
person3('Php2', 28, 'test', 1, 2, 3, city='ShangHai', job='Pyhton Engineer')
def test2(a, b, c=0, *args, key=None, **kw):
print('a =', a, 'b =', b, 'c =', c, 'args =', args, 'key=', key, 'kw =', kw)
test2(1, 2, 3, 'a', 'b', 'c', key='key', other='extra')
args = (1, 2, 3, 4)
kw = {'d': 99, 'x': '#'}
test2(*args, **kw)
python 定义函数params
就是(5, 5)
(5,) * 2 ,就是2个5的元组,乘号可以理解成相加 。"*" * 30就是30个“*"的字符串
*params作为参数nop函数Python，前面的*号就是把params元组分解成元素的意思nop函数Python，这样就分开成为2个参数nop函数Python了 。实际上传递给nop函数Python了xnop函数Python，y
于是就执行了power（5，5）
Python中定义函数默认参数值的使用注意事项？4.7.1. 默认参数值
最常用nop函数Python的一种形式是为一个或多个参数指定默认值 。这会创建一个可以使用比定义是允许的参数更少的参数调用的函数nop函数Python，例如:
def ask_ok(prompt, retries=4, complaint='Yes or no, please!'):
while True:
ok = input(prompt)
if ok in ('y', 'ye', 'yes'):

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