python_function_learning

# author: Roy.G 20211230
import sys
import time
import math

'''
def fun_1():
    print("fun_1")
    return 1
def fun_2():
    print("fun_1")
x=fun_1()
y=fun_2()
print(x)
print(y)
import time

def add():
    time_format="%y-%m-%d %X"
    time_current= time.strftime(time_format)
    with open("add.txt","a+") as f:
        f.write("%s :你好! \n"%time_current)
        print(time_current)

add()
'''
'''
def fun_1():
    print("fun_1")
    return 1,"roy",["war","guo"]
x=fun_1()
print(x[2])
'''
def fun_3(x,y):
    z=x*math.sin(y)
    return z
a=fun_3(4,1)
b=fun_3(y=1,x=4)

print(a)
print(b)