python中将函数存储在模块里（导入特定的函数）

def fun1(x):      ## 在模块module1.py中定义三个函数
    print(x.upper())

def fun2(x):
    print(x.title())

def fun3(x):
    print("---",x)

>>> fun1("aaa")
Traceback (most recent call last):
  File "<pyshell#0>", line 1, in <module>
    fun1("aaa")
NameError: name ‘fun1‘ is not defined
>>> fun2("bbb")
Traceback (most recent call last):
  File "<pyshell#1>", line 1, in <module>
    fun2("bbb")
NameError: name ‘fun2‘ is not defined
>>> fun3("ccc")
Traceback (most recent call last):
  File "<pyshell#2>", line 1, in <module>
    fun3("ccc")
NameError: name ‘fun3‘ is not defined

>>> from module1 import fun1    ## 导入特定函数fun1， 导入方法from + 模块名 + import + 函数
>>> fun1("aaaa")                ## 可以直接调用fun1
AAAA
>>> fun2("aaaa")
Traceback (most recent call last):
  File "<pyshell#5>", line 1, in <module>
    fun2("aaaa")
NameError: name ‘fun2‘ is not defined
>>> fun3("aaaa")
Traceback (most recent call last):
  File "<pyshell#6>", line 1, in <module>
    fun3("aaaa")
NameError: name ‘fun3‘ is not defined
>>> from module1 import fun2      ## 导入特定函数fun2
>>> fun2("aaaa")
Aaaa
>>> fun3("aaaa")
Traceback (most recent call last):
  File "<pyshell#9>", line 1, in <module>
    fun3("aaaa")
NameError: name ‘fun3‘ is not defined
>>> from module1 import fun3     ## 导入特定函数fun3
>>> fun3("aaaa")
--- aaaa