print(int(1.23))print(float(1))print(str(1))print(bool(1))print(bool(0))n1=255print(hex(n1))#在Python中，定义一个函数要使用def语句，依次写出函数名、括号、括号中的参数和冒号:，# 然后，在缩进块中编写函数体，函数的返回值用return语句返回#用from abstest import my_abs来导入my_abs()函数from abstestimportmy_abs print(my_abs(1))importmath def move(x, y, step,angle=0): nx=x + step * math.cos(angle)ny=y - step * math.sin(angle)returnnx, ny x, y=move(100,100,60, math.pi /6)print(x, y)importmath def quadratic(a, b, c): pass# 测试:print('quadratic(2, 3, 1) =', quadratic(2,3,1))print('quadratic(1, 3, -4) =', quadratic(1,3, -4))ifquadratic(2,3,1)!=(-0.5, -1.0): print('测试失败')elifquadratic(1,3, -4)!=(1.0, -4.0): print('测试失败')else: print('测试成功')#参数定义 Python允许你在list或tuple前面加一个*号def calc(*numbers):sum=0forninnumbers:sum=sum+ n * nreturnsumprint(calc(1,2,3))def calc(*numbers):sum=0forninnumbers:sum=sum+ n * nreturnsum#缩进不一样计算结果也不同，return语句不能放在循环里面print(calc(1,2,3))# **kw 可变参数允许你传入0个或任意个参数，这些可变参数在函数调用时自动组装为一个tuple。而关键字参数允许你传入0个或任意个含参数名的参数# **kw 关键字参数 它能接收任意数量的“关键字参数”（即 key=value 形式的数据）def person(name, age, **kw): print('name:', name,'age:', age,'other:', kw)person('Michael',30)person('Bob',35,city='Beijing')person('Adam',45,gender='M',job='Engineer')extra={'city':'Beijing','job':'Engineer'}person('Jack',24, **extra)def person(name, age, **kw):if'city'inkw:# 有city参数print('city:', kw['city'])if'job'inkw:# 有job参数print('job:', kw['job'])print('name:', name,'age:', age,'other:', kw)extra={'city':'Beijing','job':'Engineer'}person('Jack',24, **extra)#限制关键字参数的名字 * 后面必填参数def person(name, age, *, city, job): print(name, age, city, job)person('Jack',24,city='Beijing1',job='Engineer1')#参数组合 参数定义的顺序必须是：必选参数、默认参数、可变参数、命名关键字参数和关键字参数#函数允许计算两个数的乘积，请稍加改造，变成可接收一个或多个数并计算乘积：def mul(x, y):returnx * y def mul(*numbers):ifnot numbers:# 如果没有传入参数raise TypeError("mul() missing required argument")result=1fornuminnumbers: result *=numreturnresult# 测试print('mul(5) =', mul(5))print('mul(5, 6) =', mul(5,6))print('mul(5, 6, 7) =', mul(5,6,7))print('mul(5, 6, 7, 9) =', mul(5,6,7,9))ifmul(5)!=5: print('mul(5)测试失败!')elifmul(5,6)!=30: print('mul(5, 6)测试失败!')elifmul(5,6,7)!=210: print('mul(5, 6, 7)测试失败!')elifmul(5,6,7,9)!=1890: print('mul(5, 6, 7, 9)测试失败!')else: try: mul()print('mul()测试失败!')except TypeError: print('测试成功!')
