That's what execfile() is for.

http://docs.python.org/library/functions.html#execfile

1. Create a temporary file.

2. Write the content of the textbox into the file.

3. Close.

4. Execfile.

5. Delete when done.

Tasks are intended for building your application. Since Python is interpreted, you don't need to use tasks.json at all to run/debug your Python code. Use the launch.json instead. I am using Don Jayamanne's Python extension for debugging and have configured the launch.json as follows:

1. Open the Command Palette (Ctrl + Shift + P) and write the command:

   start without debugging

2. Then select your Environment -> Click Python. This should create a launch.json file within a .vscode directory in the current directory.

3. Paste the following configuration json

   {
   "version": "0.2.0",
   "configurations": [
       {
           "name": "Python",
           "type": "python",
           "request": "launch",
           "stopOnEntry": true,
           "pythonPath": "${config.python.pythonPath}",
           "program": "${file}",
           "debugOptions": [
               "WaitOnAbnormalExit",
               "WaitOnNormalExit",
               "RedirectOutput"
           ],
           "console": "integratedTerminal"
       }
   ]}
   

4. Save the file, open your python script in the editor and 'start without debugging' again. This should launch an integrated terminal where you can give input as well as see the output.

def t1():
    print(1)

def t2():
    print(2)

def t3():
    print(3)

def t4():
    print(4)

def t5():
    print(5)

def t6():
    print(6)

# put the functions in a list
functions = [t1, t2, t3, t4, t5, t6]

def go(functions):
    # .format(variable) replaces {} with the value of variable (string formatting)
    number_of_funcs = len(functions)
    greeting = "Type a number from 1 to {}: ".format(number_of_funcs)
    selected = input(greeting)
    try:
        # index to start from
        index = int(selected) - 1
    except ValueError:
        # check if the user wrote a number (exception handling)
        print('Invalid input. Not a number')
        return
    if index > number_of_funcs - 1 or index < 0:
        msg = 'Invalid input. Consider a number from 1 to {}'.format(number_of_funcs)
        print(msg)
        return
    # iterate through the functions of the list
    # starting from the index specified (list slicing)
    for f in functions[index:]:
        f()

while(True):
    # infinite loop. press Ctrl+C to abort
    go(functions)

See also

exception handling

string formatting

list slicing