How to define a global list in python and append local list to it

问题

I want to define a global list and append a list to it. I am getting a list (i[0]) by some on click event and appended that to mnum_list. Now i want create a global list and append that mnum_list to it. Any idea how to do this?

def OnClick(self, event):                                       
    name = event.GetEventObject().GetLabelText()
    cursor= self.conn.execute("SELECT * FROM ELEMENT where SYMBOL==?", (name,))
    elements = cursor.fetchall()
    print elements
    cursor= self.conn.execute("SELECT ATOMIC_NUMBER FROM ELEMENT where SYMBOL = ?", (name,))
    numbers = cursor.fetchone()[0]
    print numbers
    atomicnumber = numbers
    cursor= self.conn.execute("SELECT MOL_NUMBER FROM LINK where ELEMENT_NUMBER = ?", (atomicnumber,))
    mnumbers = cursor.fetchall()
    print mnumbers
    mnum_list = []
    for i in mnumbers:
         mnum_list.append(i[0])
    print mnum_list

回答1:

There is no need in global statement if there is no assignment, just:

def foo(x):
    sublist = range(x)
    glist.append(sublist)

and in case of extension:

def foo(x):
    sublist = range(x)
    glist.extend(sublist)

回答2:

You can declare it on the file/module level like: my_global_list = list()

and when you want to append to it inside a function you can use the global keyword. The global keyword tells python to look for the global variable.

global my_global_list

my_global_list.append()

来源：https://stackoverflow.com/questions/44645513/how-to-define-a-global-list-in-python-and-append-local-list-to-it

标签

python

list

onclick

append

global