[Tutor] Basics

[Cameron Macleod]

Hi,

I'm relatively new to this mailing list (and python!) and I would greatly
appreciate some exercises to try or something to get me familiar with the
system.

Thanks,

Cameron Macleod
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[Tutor] Infinite Loop

[Cameron Macleod]

Hi,

I've been trying to code a simple guess my number game as a starter
programming project but I've generated an infinite loop accidentally. Since
I'm new to programming in general, I can't really figure out what's causing
it. Thanks

===

import random

print("\tWelcome to 'Guess my Number'!")
print("\nI'm thinking of a number between 1 and 100.")
print("Try to guess it in as few attempts as possible.\n")

#set the initial values
the_number = random.randint(1, 100)
guess = int(input("Take a guess: "))
tries = 1

# guessing loop
while guess != the_number:
if guess > the_number:
print("Lower...")
else:
print("Higher...")

guess = int(input("Take a guess: "))
tries += 1

print("You guessed it! The number was", the_number)
print("And it only took you", tries, "tries!\n")

if tries <= 5:
print("I didn't know roadrunners could type!")
elif tries >= 99:
print("P'raps 'Only' wasn't the right word...")
elif tries == 100:
print("0_0 You are the unluckiest person in the world. Or the
stupidest...")

input("\n\nPress the enter key to exit.")
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[Tutor] Input

[Cameron Macleod]

Hi,

When you type

Input("\n\nPress The Enter Key To Exit")

it forces you to press the enter key to close the program. Why is it the
enter key instead of e.g. the 'esc' key?
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[Tutor] Time subtractrion

[Cameron Macleod]

Hi,

I've been trying to code a timer that tells you how long you've been on the
net and I can't figure out how to produce a figure in hours, minutes and
seconds that is constantly being updated. If anyone could point out a
module with functions like this or built in functions, I'd be very grateful.

Cameron
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[Tutor] __init__ doesn't seem to be running

[Cameron Macleod]

Hello everyone, I'm using Python 3.3 and am trying to write a simple to-do
list program. I have a class which runs pretty much everything called todo
and the __init__ method doesn't seem to be running.

class todo():
def __init__(self):
tasks = []

def writeTask(todoList):
name = input("Please enter the task > ")
desc = input("Please enter a short description (optional) > ")
while True:
try:
imp = int(input("How important is this task? 1-100 > "))
break
except TypeError:
imp = int(input("How important is this task? 1-100 > "))
if imp > 100:
imp = 100
elif imp < 1:
imp = 1
todoList.write("\"" + name + "\",\"" + desc + "\",\"" + str(imp) +
"\"")
print("Task written!")
try:
todoList = open('todo.txt', 'r+')
except IOError:
todoList = open('todo.txt', 'w')
for line in todoList:
tasks.append(line.strip())
writeTask(todoList)
todoList.close()

main = todo()

Whenever I run this, I get the error:

Traceback (most recent call last):
  File "C:\Python33\todo.py", line 8, in 
class todo():
  File "C:\Python33\todo.py", line 34, in todo
tasks.append(line.strip())
NameError: name 'tasks' is not defined

Indicating that __init__ hasn't run since that is the initialization for
tasks. I had always understood that __init__ was the equivalent of a
constructor, and should be run at the instantiation of any class.

Any help would be much appreciated,
Cameron
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Re: [Tutor] __init__ doesn't seem to be running

[Cameron Macleod]

I added the "self." to both the references to tasks and then I added the
print statement to the __init__ function and I got the dreaded NameError of
death:


Traceback (most recent call last):
  File "C:\Python33\todo.py", line 6, in 
class todo:
  File "C:\Python33\todo.py", line 31, in todo
self.tasks.append(line.strip())
NameError: name 'self' is not defined

I then moved the entirety of the code that appeared outside of the
functions but within the class into the writeTask function, this produced
the longed after print statement and no errors, but was inappropriate for
the task in hand. So I re-jiggled most of it into the __init__ method and
left the call to writeTask outside of the class, passing in the argument
main.todoList . This gave me the print statement (the init is running now!)
but also this error:


Traceback (most recent call last):
  File "C:\Python33\todo.py", line 34, in 
main.writeTask(main.todoList)
AttributeError: 'todo' object has no attribute 'todoList'

I fixed this with an attachment to self on the todoList object, but then
got this error instead.

Traceback (most recent call last):
  File "C:\Python33\todo.py", line 34, in 
main = todo()
  File "C:\Python33\todo.py", line 14, in __init__
for line in todoList:
NameError: global name 'todoList' is not defined

My code now looks something like this:

class todo():
def __init__(self):
self.tasks = []
print("Hello")
try:
self.todoList = open('todo.txt', 'r+')
except IOError:
self.todoList = open('todo.txt', 'w')
for line in todoList:
self.tasks.append(line.strip())


def writeTask(todoList):
name = input("Please enter the task > ")
desc = input("Please enter a short description (optional) > ")
while True:
try:
imp = int(input("How important is this task? 1-100 > "))
break
except TypeError:
imp = int(input("How important is this task? 1-100 > "))
if imp > 100:
imp = 100
elif imp < 1:
imp = 1
todoList.write("\"" + name + "\",\"" + desc + "\",\"" + str(imp) +
"\"")
print("Task written!")


main = todo()
main.writeTask(main.todoList)

It's recognising todoList as global now which is better than not being
acknowledged at all, but why would it not be defined?

(Sorry if this came up twice, wasn't sure whether or not I'd replied to all)


On Fri, Mar 15, 2013 at 9:42 PM, Hugo Arts  wrote:

> On Fri, Mar 15, 2013 at 9:21 PM, Cameron Macleod <
> cmacleod...@googlemail.com> wrote:
>
>> Hello everyone, I'm using Python 3.3 and am trying to write a simple
>> to-do list program. I have a class which runs pretty much everything called
>> todo and the __init__ method doesn't seem to be running.
>>
>> class todo():
>> def __init__(self):
>> tasks = []
>>
>> def writeTask(todoList):
>> name = input("Please enter the task > ")
>> desc = input("Please enter a short description (optional) > ")
>> while True:
>> try:
>> imp = int(input("How important is this task? 1-100 > "))
>> break
>> except TypeError:
>> imp = int(input("How important is this task? 1-100 > "))
>> if imp > 100:
>> imp = 100
>> elif imp < 1:
>> imp = 1
>> todoList.write("\"" + name + "\",\"" + desc + "\",\"" + str(imp)
>> + "\"")
>> print("Task written!")
>> try:
>> todoList = open('todo.txt', 'r+')
>> except IOError:
>> todoList = open('todo.txt', 'w')
>> for line in todoList:
>> tasks.append(line.strip())
>> writeTask(todoList)
>> todoList.close()
>>
>> main = todo()
>>
>> Whenever I run this, I get the error:
>>
>> Traceback (most recent call last):
>>   File "C:\Python33\todo.py", line 8, in 
>> class todo():
>>   File "C:\Python33\todo.py", line 34, in todo
>> tasks.append(line.strip())
>> NameError: name 'tasks' is not defined
>>
>> Indicating that __init__ hasn't run since that is the initialization for
>> ta