raw_input that able to do detect multiple input
Dave Angel
davea at davea.name
Sun Apr 7 00:36:14 EDT 2013
On 04/06/2013 11:22 PM, Frank wrote:
> Hi Dave,
>
>
> Sorry for my unclear question.
> I didn't use the d = load_friends('friends.csv') now because I'm going use it for other function later on, I should have remove it first to avoid confusion.
>
> This is the code for load_friends , add_info ,display_friends, save_friends function:
>
> def load_friends(filename):
> f = open(filename, 'rU')
> for row in f:
> return list (row.strip() for row in f)
This is a mighty confusing way of skipping the first line. You make it
look like a loop, but it only executes once, since you have a return
inside. Besides, when you save the data, you don't put an extra header
line at the top. So it's not consistent.
>
> def add_info(new_info, new_list):
> # Persons name is the first item of the list
> name = new_info[0]
> # Check if we already have an item with that name
> for item in new_list:
> if item[0] == name:
> print "%s is already in the list" % name
> return False
> # Insert the item into the list
> new_list.append(new_info)
> return True
>
> def display_friends(name, friends_list):
> Fname = name[0]
> for item in friends_list:
> if item[0] == Fname:
> print item
> break
> else:
> print False
>
> def save_friends(friend_info, new_list):
> with open(friend_info, 'w') as f:
> for line in new_list:
> f.write(line + '\n')
Now you've saved the data in a different file. How does the next run of
the program find it?
>
>
> I will elaborate my question further , when the user type the function call interact()
What user? In what environment can a user enter function calls into
your code?
> this will appear :
>
> interact()
> Friends File: friends.csv
>
> so after which the user would type in the command call maybe we call it " F John Cleese", the program need to know if the user input contain a "f" "a" or "e" at the first char and
>
> if 'f' it mean it would takes a name as an argument, prints out the information about that friend or prints an error message if the given name is notthe name of a friend in the database(friends.csv).
>
> if "a" it would takes four arguments (comma separated) with information
> about a person and adds that person as a friend. An error message is printed
> if that person is already a friend.
>
> if "e" it would ends the interaction and, if the friends information has been
> updated, the information is saved to the friends.csv.
>
> This is the example output
>
> Command: f John Cleese
> John Cleese: Ministry of Silly Walks, 5555421, 27 October
> Command: f Michael Palin
> Unknown friend Michael Palin
> Command: f
> Invalid Command: f
Why is the command invalid?
> Command: a Michael Palin
> Invalid Command: a Michael Palin
> Command: a John Cleese, Cheese Shop, 5552233, 5 May
> John Cleese is already a friend
That's not the way the message is worded in the code
> Command: a Michael Palin, Cheese Shop, 5552233, 5 May
> Command: f Michael Palin
> Michael Palin: Cheese Shop, 5552233, 5 May
> Command: e
> Saving changes...
> Exiting...
>
> So currently I think i had my other functions ready but I do not know how do i apply it into interact()
>
> my rough idea is :
>
> def interact(*arg):
> open('friends.csv', 'rU')
> d = load_friends('friends.csv')
> print "Friends File: friends.csv"
> s = raw_input()
> command = s.split(" ", 1)
> if "f" in command:
You don't really want "in" here. You just want the first field to match
"f" So why not:
if "f" == command[0]:
> # invoke display_friends function
In this function and in save_friends, there is no return value, so not
clear what you mean by 'result'
> print result
> elif "a" in command:
> # invoke add_info function
> print result
> elif "e" in command:
> # invoke save_friends function
> print result
>
> My idea is to split the user command out to ['f', 'John Cleese'] and use the 'F' to invoke my "f" in the if statement and then i would use the display_friends function to process 'John Cleese' but i'm not sure if i'm able to do it this way
>
>
It's all over but the debugging. What's the real question?
--
DaveA
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