How to create an app manager

[_ShevaKadu]

There are a few things going on here.

The first problem is the arg for the inner exec is not a string.

exec(open('Applications/' + application0.cget('text') + '.py').read())

Because the arg is not a string it tries to find application0, and that does not exist anywhere.

There is a desktop['application0'], but that does you little good. By the time you press the button and execute the lambda, desktop is long gone. In the example below the f2 lambda references a variable local to f2. This raises a NameError exception. f1 references a module variable and it works.

globname = 'Popeye'

def f1():
    command = lambda: [exec("try: \n\texec('print(globname)') \nexcept Exception as err: \n\tprint(err)")]
    command()

def f2():
    locname = globname
    command = lambda: [exec("try: \n\texec('print(locname)') \nexcept Exception as err: \n\tprint(err)")]
    command()

f1()
f2()

Output:
Popeye
name 'locname' is not defined

But there is a far better solution. Use a partial. Partial function arguments are evaluated when the partial is created, not when the partial is executed. This lets you use local variables in a partial. Below I have a callback function to run the app when a button is pressed. The 'app' argument is the text you would evaluate to run the application

from functools import partial

def runapp(app):
    try:
        popen(app)
    except Exception as err: 
        print(err)

def manager():
    desktop = {}
    canvas = Canvas(corwin, bd=100)
    canvas.place(x=105, y=0, relwidth=0.9, relheight=1, anchor=NW)
    appfile = open('Applications/apps.corwin')
    apps = ast.literal_eval(appfile.read())
    for appname, appcmd in apps.items()
        btn = Button(corwin, text=(appname), anchor='e', bg='black', font=('DIN Alternate', '15'), \
                     command=partial(runapp, appcmd)
        btn.place(x=100, y=(25*x), width=100, anchor=NE)

I would change the app file to to be name:command where command is whatever text you would evaluate to run the command.
{'manager':'python manager.py'}

There are a few things going on here.

The first problem is the arg for the inner exec is not a string.

exec(open('Applications/' + application0.cget('text') + '.py').read())

Because the arg is not a string it tries to find application0, and that does not exist anywhere.

There is a desktop['application0'], but that does you little good. By the time you press the button and execute the lambda, desktop is long gone. In the example below the f2 lambda references a variable local to f2. This raises a NameError exception. f1 references a module variable and it works.

globname = 'Popeye'

def f1():
    command = lambda: [exec("try: \n\texec('print(globname)') \nexcept Exception as err: \n\tprint(err)")]
    command()

def f2():
    locname = globname
    command = lambda: [exec("try: \n\texec('print(locname)') \nexcept Exception as err: \n\tprint(err)")]
    command()

f1()
f2()

Output:
Popeye
name 'locname' is not defined

But there is a far better solution. Use a partial. Partial function arguments are evaluated when the partial is created, not when the partial is executed. This lets you use local variables in a partial. Below I have a callback function to run the app when a button is pressed. The 'app' argument is the text you would evaluate to run the application

from functools import partial

def runapp(app):
    try:
        popen(app)
    except Exception as err: 
        print(err)

def manager():
    desktop = {}
    canvas = Canvas(corwin, bd=100)
    canvas.place(x=105, y=0, relwidth=0.9, relheight=1, anchor=NW)
    appfile = open('Applications/apps.corwin')
    apps = ast.literal_eval(appfile.read())
    for appname, appcmd in apps.items()
        btn = Button(corwin, text=(appname), anchor='e', bg='black', font=('DIN Alternate', '15'), \
                     command=partial(runapp, appcmd)
        btn.place(x=100, y=(25*x), width=100, anchor=NE)

I would change the app file to to be name:command where command is whatever text you would evaluate to run the command.
{'manager':'python manager.py'}

Wow! That was so useful! But would those functions work if I convert them into a one string function?