查看python函数参数 python查看函数功能

python怎样查询函数参数可以取哪些值由于Python语言的动态类型特性查看python函数参数,在集成开发环境或编辑工具编码时,给予的代码提示及自动完成功能不象静态语言工具(比如使用VisualStudio开发C#)那样充分 。
实现开发过程中,查看python函数参数我们借助于相关插件或使用Python内置函数"help()”来查看某个函数的参数说明,以查看内置函数sorted()为例查看python函数参数:
help(sorted)Help on built-in function sorted in module builtins: sorted(iterable, key=None, reverse=False)Return a new list containing all items from the iterable in ascending order.A custom key function can be supplied to customise the sort order, and thereverse flag can be set to request the result in descending order.
Python获取函数参数个数和默认参数创建一个函数用来计算三个数的和,如下:
下来,我们对其进行调用:
假设我们要计算这个函数返回结果的平均值 。那么此时,我们只需将和值除以参数个数即可 , 那么参数个数怎么获取呢?你可能会说:数一下就知道了 。那么假设此时有很多的参数,你还去数吗?此时,明显这个方法是不恰当的,那么有没有更加方便、高效的方法呢?我们接着往下看 。
通过上面这个例子,我们不但可以获取参数个数,还可以获取所有变量名以及默认返回值 。此时,我们只需根据自己的需求,去应用就可以了,那么以上的问题 , 就自然解决了 。
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):
# 增加查看python函数参数了参数查看python函数参数的检查
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!')
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
【查看python函数参数 python查看函数功能】 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')

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