"""
NAME = 'alex' # global variable be capital
def change_name():
global name # if no declaring the global name can also change the clglobal variable bu using the method of list:such as .appened()
name = 'handsome' # local variable,be lower-case can have the same name,the difference between "c" program
print('abcd',name)
change_name()
print(name)
# ***********Function nest fuction*********
NAME = 'alex'
def zxver():
name = 'zxver'
print(name)
def liu():
name = 'liu'
print(name)
def linda():
name = 'linda'
print(name)
print(name)
linda()
liu()
print(name)
zxver()
# ********import easily be wrong
AssertionErrorname = 'alex'
def zxver():
name = 'zxver'
def liu():
#1:global name
nonlocal name
# 2:last stage's variable
name = 'liu'
liu()
print(name)
# ********1:print:zxver************
# ********2:print:liu************
print(name)
zxver()
print(name)
# be careful: before the quote ,every function must be defined or will report wrong
# ********recursion***************
def calc(n):
print(n)
if (int(n/2) == 0):
return(n)
res = calc(int(n / 2))
return(res)
calc(10)
"""
# *********defect:low efficiency*******
import time
person_list = ['alex','keyu','zxver','linda']
def askway(person_list):
print('-'*60)
if len(person_list) == 0:
return 'no one knows the way'
person = person_list.pop(0)
if person == 'zxver':
return '%ssaid the way is turn left'%person
print('do you know the way of the hall')
print('%ssaid I do not know the way but i can ask %s'%(person,person_list))
time.sleep(5)
res = askway(person_list)
print('%s the result is :%res'%(person,res))
return res
res = askway(person_list)
print(res)
