Mixing
Python 3 Jump Tables
I am trying to figure out how to create a basic jump table, so I can better understand different ways of creating menus in Python 3.5.6. Here is what I have so far:
def command():
selection = input("Please enter your selection: ")
return selection
def one():
print ("you have selected menu option one")
def two():
print ("you have selected menu option two")
def three():
print ("you have selected menu option three")
def runCommand(command):
jumpTable = 0
jumpTable[command]()
jumpTable = {}
jumpTable['1'] = one
jumpTable['2'] = two
jumpTable['3'] = three
def main():
command()
runCommand(command)
if __name__ == "__main__":
main()
As far as I understand, a jump table is simply a way of making a menu selection and calling a specific function associated with that numerical value, taken in by my "command" function. Within the jumpTable, you assign the function to call.
I am getting " File "omitted", line 16, in runCommandjumpTableone
TypeError: 'int' object is not subscriptable
All I want to do is have the user enter a number - 1, 2 or 3 and have that function run. when I get this basic functionality down, I will expand the menu to show the options and be more clear. I just need to get the darn thing to run!
Yes, I am aware of other ways to create menus (IF/ELIF/ELSE) I am just trying to nail this one down!
Thank you in advance!
python-3.x
asked Nov 19 '18 at 19:37
Larry FitzgeraldLarry Fitzgerald
63
add a comment |
I am trying to figure out how to create a basic jump table, so I can better understand different ways of creating menus in Python 3.5.6. Here is what I have so far:
def command():
selection = input("Please enter your selection: ")
return selection
def one():
print ("you have selected menu option one")
def two():
print ("you have selected menu option two")
def three():
print ("you have selected menu option three")
def runCommand(command):
jumpTable = 0
jumpTable[command]()
jumpTable = {}
jumpTable['1'] = one
jumpTable['2'] = two
jumpTable['3'] = three
def main():
command()
runCommand(command)
if __name__ == "__main__":
main()
As far as I understand, a jump table is simply a way of making a menu selection and calling a specific function associated with that numerical value, taken in by my "command" function. Within the jumpTable, you assign the function to call.
I am getting " File "omitted", line 16, in runCommandjumpTableone
TypeError: 'int' object is not subscriptable
All I want to do is have the user enter a number - 1, 2 or 3 and have that function run. when I get this basic functionality down, I will expand the menu to show the options and be more clear. I just need to get the darn thing to run!
Yes, I am aware of other ways to create menus (IF/ELIF/ELSE) I am just trying to nail this one down!
Thank you in advance!
python-3.x
asked Nov 19 '18 at 19:37
Larry FitzgeraldLarry Fitzgerald
63
1
You initialize jumptable to 1 instead of a container , then try to index it. As the error already said, that is not valid. You have to properly build your jump table before using it.
– MisterMiyagi
Nov 19 '18 at 19:41
add a comment |
I am trying to figure out how to create a basic jump table, so I can better understand different ways of creating menus in Python 3.5.6. Here is what I have so far:
def command():
selection = input("Please enter your selection: ")
return selection
def one():
print ("you have selected menu option one")
def two():
print ("you have selected menu option two")
def three():
print ("you have selected menu option three")
def runCommand(command):
jumpTable = 0
jumpTable[command]()
jumpTable = {}
jumpTable['1'] = one
jumpTable['2'] = two
jumpTable['3'] = three
def main():
command()
runCommand(command)
if __name__ == "__main__":
main()
As far as I understand, a jump table is simply a way of making a menu selection and calling a specific function associated with that numerical value, taken in by my "command" function. Within the jumpTable, you assign the function to call.
I am getting " File "omitted", line 16, in runCommandjumpTableone
TypeError: 'int' object is not subscriptable
All I want to do is have the user enter a number - 1, 2 or 3 and have that function run. when I get this basic functionality down, I will expand the menu to show the options and be more clear. I just need to get the darn thing to run!
Yes, I am aware of other ways to create menus (IF/ELIF/ELSE) I am just trying to nail this one down!
Thank you in advance!
python-3.x
asked Nov 19 '18 at 19:37
Larry FitzgeraldLarry Fitzgerald
63
I am trying to figure out how to create a basic jump table, so I can better understand different ways of creating menus in Python 3.5.6. Here is what I have so far:
def command():
selection = input("Please enter your selection: ")
return selection
def one():
print ("you have selected menu option one")
def two():
print ("you have selected menu option two")
def three():
print ("you have selected menu option three")
def runCommand(command):
jumpTable = 0
jumpTable[command]()
jumpTable = {}
jumpTable['1'] = one
jumpTable['2'] = two
jumpTable['3'] = three
def main():
command()
runCommand(command)
if __name__ == "__main__":
main()
As far as I understand, a jump table is simply a way of making a menu selection and calling a specific function associated with that numerical value, taken in by my "command" function. Within the jumpTable, you assign the function to call.
I am getting " File "omitted", line 16, in runCommandjumpTableone
TypeError: 'int' object is not subscriptable
All I want to do is have the user enter a number - 1, 2 or 3 and have that function run. when I get this basic functionality down, I will expand the menu to show the options and be more clear. I just need to get the darn thing to run!
Yes, I am aware of other ways to create menus (IF/ELIF/ELSE) I am just trying to nail this one down!
Thank you in advance!
python-3.x
python-3.x
asked Nov 19 '18 at 19:37
Larry FitzgeraldLarry Fitzgerald
63
asked Nov 19 '18 at 19:37
Larry FitzgeraldLarry Fitzgerald
63
asked Nov 19 '18 at 19:37
Larry FitzgeraldLarry Fitzgerald
63
asked Nov 19 '18 at 19:37
Larry FitzgeraldLarry Fitzgerald
63
asked Nov 19 '18 at 19:37
Larry FitzgeraldLarry Fitzgerald
63
63
1
You initialize jumptable to 1 instead of a container , then try to index it. As the error already said, that is not valid. You have to properly build your jump table before using it.
– MisterMiyagi
Nov 19 '18 at 19:41
add a comment |
1
You initialize jumptable to 1 instead of a container , then try to index it. As the error already said, that is not valid. You have to properly build your jump table before using it.
– MisterMiyagi
Nov 19 '18 at 19:41
1
1
You initialize jumptable to 1 instead of a container , then try to index it. As the error already said, that is not valid. You have to properly build your jump table before using it.
– MisterMiyagi
Nov 19 '18 at 19:41
You initialize jumptable to 1 instead of a container , then try to index it. As the error already said, that is not valid. You have to properly build your jump table before using it.
– MisterMiyagi
Nov 19 '18 at 19:41
add a comment |
1 Answer
1
active
oldest
votes
You are quite close. The only issue is that you are trying to access the command before creating the jumpTable. And I am also not sure why you are setting the variable to 0 first (that's why you get the int is not subscriptible error). So, this is the right order:
def runCommand(command):
jumpTable = {}
jumpTable['1'] = one
jumpTable['2'] = two
jumpTable['3'] = three
jumpTable[command]()
By the way, if you are always creating the same jumpTable, you could create it once, outside the function and simply call jumpTable[command]() in your main function.
Another problem: you should store the value you get from the user and pass that to the next function like this:
cmd = command()
runCommand(cmd)
, or simply pipe the two functions together like this:
runCommand(command())
answered Nov 19 '18 at 19:48
zsomkozsomko
4966
KeyError: <function command at 0x0000000001E15400> So now apparently it cannot find the key value, so it spits out a memory location... In the past, I would always build my dictionaries so I would know the value. In this case it seems it's built on the fly. I adjusted my code with what you said zsomko.
– Larry Fitzgerald
Nov 19 '18 at 20:23
Your problem is now what I have described in the part after "Another problem" in my reply. You are trying to index your dictionary with the function named command, not the return value of that function.
– zsomko
Nov 19 '18 at 21:20
add a comment |
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1 Answer
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You are quite close. The only issue is that you are trying to access the command before creating the jumpTable. And I am also not sure why you are setting the variable to 0 first (that's why you get the int is not subscriptible error). So, this is the right order:
def runCommand(command):
jumpTable = {}
jumpTable['1'] = one
jumpTable['2'] = two
jumpTable['3'] = three
jumpTable[command]()
By the way, if you are always creating the same jumpTable, you could create it once, outside the function and simply call jumpTable[command]() in your main function.
Another problem: you should store the value you get from the user and pass that to the next function like this:
cmd = command()
runCommand(cmd)
, or simply pipe the two functions together like this:
runCommand(command())
answered Nov 19 '18 at 19:48
zsomkozsomko
4966
KeyError: <function command at 0x0000000001E15400> So now apparently it cannot find the key value, so it spits out a memory location... In the past, I would always build my dictionaries so I would know the value. In this case it seems it's built on the fly. I adjusted my code with what you said zsomko.
– Larry Fitzgerald
Nov 19 '18 at 20:23
Your problem is now what I have described in the part after "Another problem" in my reply. You are trying to index your dictionary with the function named command, not the return value of that function.
– zsomko
Nov 19 '18 at 21:20
add a comment |
You are quite close. The only issue is that you are trying to access the command before creating the jumpTable. And I am also not sure why you are setting the variable to 0 first (that's why you get the int is not subscriptible error). So, this is the right order:
def runCommand(command):
jumpTable = {}
jumpTable['1'] = one
jumpTable['2'] = two
jumpTable['3'] = three
jumpTable[command]()
By the way, if you are always creating the same jumpTable, you could create it once, outside the function and simply call jumpTable[command]() in your main function.
Another problem: you should store the value you get from the user and pass that to the next function like this:
cmd = command()
runCommand(cmd)
, or simply pipe the two functions together like this:
runCommand(command())
answered Nov 19 '18 at 19:48
zsomkozsomko
4966
KeyError: <function command at 0x0000000001E15400> So now apparently it cannot find the key value, so it spits out a memory location... In the past, I would always build my dictionaries so I would know the value. In this case it seems it's built on the fly. I adjusted my code with what you said zsomko.
– Larry Fitzgerald
Nov 19 '18 at 20:23
Your problem is now what I have described in the part after "Another problem" in my reply. You are trying to index your dictionary with the function named command, not the return value of that function.
– zsomko
Nov 19 '18 at 21:20
add a comment |
You are quite close. The only issue is that you are trying to access the command before creating the jumpTable. And I am also not sure why you are setting the variable to 0 first (that's why you get the int is not subscriptible error). So, this is the right order:
def runCommand(command):
jumpTable = {}
jumpTable['1'] = one
jumpTable['2'] = two
jumpTable['3'] = three
jumpTable[command]()
By the way, if you are always creating the same jumpTable, you could create it once, outside the function and simply call jumpTable[command]() in your main function.
Another problem: you should store the value you get from the user and pass that to the next function like this:
cmd = command()
runCommand(cmd)
, or simply pipe the two functions together like this:
runCommand(command())
answered Nov 19 '18 at 19:48
zsomkozsomko
4966
You are quite close. The only issue is that you are trying to access the command before creating the jumpTable. And I am also not sure why you are setting the variable to 0 first (that's why you get the int is not subscriptible error). So, this is the right order:
def runCommand(command):
jumpTable = {}
jumpTable['1'] = one
jumpTable['2'] = two
jumpTable['3'] = three
jumpTable[command]()
By the way, if you are always creating the same jumpTable, you could create it once, outside the function and simply call jumpTable[command]() in your main function.
Another problem: you should store the value you get from the user and pass that to the next function like this:
cmd = command()
runCommand(cmd)
, or simply pipe the two functions together like this:
runCommand(command())
answered Nov 19 '18 at 19:48
zsomkozsomko
4966
answered Nov 19 '18 at 19:48
zsomkozsomko
4966
answered Nov 19 '18 at 19:48
zsomkozsomko
4966
answered Nov 19 '18 at 19:48
zsomkozsomko
4966
4966
KeyError: <function command at 0x0000000001E15400> So now apparently it cannot find the key value, so it spits out a memory location... In the past, I would always build my dictionaries so I would know the value. In this case it seems it's built on the fly. I adjusted my code with what you said zsomko.
– Larry Fitzgerald
Nov 19 '18 at 20:23
Your problem is now what I have described in the part after "Another problem" in my reply. You are trying to index your dictionary with the function named command, not the return value of that function.
– zsomko
Nov 19 '18 at 21:20
add a comment |
KeyError: <function command at 0x0000000001E15400> So now apparently it cannot find the key value, so it spits out a memory location... In the past, I would always build my dictionaries so I would know the value. In this case it seems it's built on the fly. I adjusted my code with what you said zsomko.
– Larry Fitzgerald
Nov 19 '18 at 20:23
Your problem is now what I have described in the part after "Another problem" in my reply. You are trying to index your dictionary with the function named command, not the return value of that function.
– zsomko
Nov 19 '18 at 21:20
KeyError: <function command at 0x0000000001E15400> So now apparently it cannot find the key value, so it spits out a memory location... In the past, I would always build my dictionaries so I would know the value. In this case it seems it's built on the fly. I adjusted my code with what you said zsomko.
– Larry Fitzgerald
Nov 19 '18 at 20:23
KeyError: <function command at 0x0000000001E15400> So now apparently it cannot find the key value, so it spits out a memory location... In the past, I would always build my dictionaries so I would know the value. In this case it seems it's built on the fly. I adjusted my code with what you said zsomko.
– Larry Fitzgerald
Nov 19 '18 at 20:23
Your problem is now what I have described in the part after "Another problem" in my reply. You are trying to index your dictionary with the function named command, not the return value of that function.
– zsomko
Nov 19 '18 at 21:20
Your problem is now what I have described in the part after "Another problem" in my reply. You are trying to index your dictionary with the function named command, not the return value of that function.
– zsomko
Nov 19 '18 at 21:20
add a comment |
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You initialize jumptable to 1 instead of a container , then try to index it. As the error already said, that is not valid. You have to properly build your jump table before using it.
– MisterMiyagi
Nov 19 '18 at 19:41