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Re: A Thread For Tutorial On Python Programming by Skye123: 7:19pm On May 18, 2021
I'm sorry for derailing the thread, guys. Pls, can someone explain what mutable and immutable data types are?? I understand that mutable can be changed and immutable cannot be. But, how do you write the codes?? The codes look smh confusing. For example:
list_values = [1, 2, 3]
set_values = (1, 2, 3)
print(id(list_values))
print(id(set_values))
print()

list_values += [4, 5, 6]
set_values += (4, 5, 6)
print(id(list_values))
print(id(set_values))

Output:
515314983168
515315121920

515314983168
515315333056

I don't understand how the code produced that. Pls, can someone explain
Re: A Thread For Tutorial On Python Programming by Kaydon001: 11:55am On May 19, 2021
Skye123:
I'm sorry for derailing the thread, guys. Pls, can someone explain what mutable and immutable data types are?? I understand that mutable can be changed and immutable cannot be. But, how do you write the codes?? The codes look smh confusing. For example:
list_values = [1, 2, 3]
set_values = (1, 2, 3)
print(id(list_values))
print(id(set_values))
print()

list_values += [4, 5, 6]
set_values += (4, 5, 6)
print(id(list_values))
print(id(set_values))

Output:
515314983168
515315121920

515314983168
515315333056

I don't understand how the code produced that. Pls, can someone explain

You use Python in-build function id() which is used to get the location of object in memory which is mostly integers “1234838293”. The long integer you are is the location of the list and tuple in the memory of your code and you get different results because list and tuple are mutable even tho they have thesame values in them.

You will get thesame results when used with immutable values like integers or strings ...


As to how to write code mutability of let’s say a list
You can change the values of a list through indexing, you can make use of a for loop, you can also do it through list comprehension e.g

prices = [99.95, 72.50, 30.00, 29.95, 55.00]
I can change values in the price list using the index method. Say we want to change the price at index 2 which is 30.00 to 104.95 we do that using

prices[2] = 104.95
print(prices)

Result- [99.95, 72.5, 104.95, 29.95, 55.0]

Which show our price list has been updated with the new price at index 2.. you cam read up the other ones

2 Likes

Re: A Thread For Tutorial On Python Programming by deept(m): 7:21pm On May 22, 2021
Hello guys,

could you help look at the code; this is what i'm trying to achieve but not quite getting the output desired

Write a program that repeatedly prompts a user for integer numbers until the user enters 'done'. Once 'done' is entered, print out the largest and smallest of the numbers. If the user enters anything other than a valid number catch it with a try/except and put out an appropriate message and ignore the number. Enter 7, 2, bob, 10, and 4 and match the output below.
Desired Output
Invalid input
Maximum is 10
Minimum is 2


num = input("Enter a number: "wink
largest = num
smallest = num
while True:
num = input("Enter a number: "wink

if num == "done":
break

try:
int(num)
except:
print("Invalid input"wink
continue

if largest < num:
largest = num
elif smallest > num:
smallest = num

#print(num)

print(f"Maximum is {largest}"wink
print(f"Minimum is {smallest}"wink

1 Like

Re: A Thread For Tutorial On Python Programming by Stark416: 8:08am On May 24, 2021
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Re: A Thread For Tutorial On Python Programming by zizytd(m): 8:45am On May 24, 2021

def min_max():
list_number = []
while True:
num = input("Please Enter a number: " )
if num == "done":
break
else:
try:
list_number.append(int(num))
except ValueError:
print("Invalid input" )
print(f"Maximum is {max(list_number)}" )
print(f"Minimum is {min(list_number)}" )

deept:
Hello guys,

could you help look at the code; this is what i'm trying to achieve but not quite getting the output desired

Write a program that repeatedly prompts a user for integer numbers until the user enters 'done'. Once 'done' is entered, print out the largest and smallest of the numbers. If the user enters anything other than a valid number catch it with a try/except and put out an appropriate message and ignore the number. Enter 7, 2, bob, 10, and 4 and match the output below.
Desired Output
Invalid input
Maximum is 10
Minimum is 2


num = input("Enter a number: "wink
largest = num
smallest = num
while True:
num = input("Enter a number: "wink

if num == "done":
break

try:
int(num)
except:
print("Invalid input"wink
continue

if largest < num:
largest = num
elif smallest > num:
smallest = num

#print(num)

print(f"Maximum is {largest}"wink
print(f"Minimum is {smallest}"wink

1 Like

Re: A Thread For Tutorial On Python Programming by deept(m): 11:08am On May 24, 2021
thanks @ zizytd

i see what you did using a list. I am just starting on python and this was an exercise on loops and iteration, haven't really explored lists. This exercise took a long time for me to solve but learnt a lot on what not to do. eventually got it right:


while True:
num = input("Enter a number: "wink
try:
int(num)
except:
print("Invalid input"wink
continue
num = int(num)
if type(num) == int:
break

largest = num
smallest = num

while True:
num = input("Enter a number: "wink
if num == 'done':
break
try:
int(num)
except:
print("Invalid input"wink
continue
num = int(num)
if num > largest:
largest = num
elif num < smallest:
smallest = num
print(f"Maximum is {largest}"wink
print(f"Minimum is {smallest}"wink
Re: A Thread For Tutorial On Python Programming by deept(m): 11:10am On May 24, 2021
@zizytd,

also in your code, after the except you put valueerror, is that necessary?
Re: A Thread For Tutorial On Python Programming by zizytd(m): 11:40am On May 24, 2021
nice , weldone . I just started learning late last year but with constant practice, I have become so much better.
deept:
thanks @ zizytd

i see what you did using a list. I am just starting on python and this was an exercise on loops and iteration, haven't really explored lists. This exercise took a long time for me to solve but learnt a lot on what not to do. eventually got it right:


while True:
num = input("Enter a number: "wink
try:
int(num)
except:
print("Invalid input"wink
continue
num = int(num)
if type(num) == int:
break

largest = num
smallest = num

while True:
num = input("Enter a number: "wink
if num == 'done':
break
try:
int(num)
except:
print("Invalid input"wink
continue
num = int(num)
if num > largest:
largest = num
elif num < smallest:
smallest = num
print(f"Maximum is {largest}"wink
print(f"Minimum is {smallest}"wink


Re: A Thread For Tutorial On Python Programming by zizytd(m): 11:47am On May 24, 2021
try and except is to catch possible error messages , for this why I used ValueError because if you put int("bob"wink you will get a ValueError error. If you don't put the type of error it catches all kinds of errors(eg ValueError,TypeError,OsError etc). So it will still work but the only problem is when you want to catch a particular type of error message.
deept:
@zizytd,

also in your code, after the except you put valueerror, is that necessary?
Re: A Thread For Tutorial On Python Programming by deept(m): 11:50am On May 24, 2021
zizytd:
try and except is to catch possible error messages , for this why I used ValueError because if you put int("bob"wink you will get a ValueError error. If you don't put the type of error it catches all kinds of errors(eg ValueError,TypeError,OsError etc). So it will still work but the only problem is when you want to catch a particular type of error message.

Ok, I see. Muchos gracias
Re: A Thread For Tutorial On Python Programming by Nobody: 11:59am On May 30, 2021
Paapii3d:
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Re: A Thread For Tutorial On Python Programming by Nobody: 12:00pm On May 30, 2021
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Re: A Thread For Tutorial On Python Programming by mosco04: 5:06pm On Jun 04, 2021
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Re: A Thread For Tutorial On Python Programming by bodhini: 12:47pm On Jun 05, 2021
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Re: A Thread For Tutorial On Python Programming by UARBIAFRAODUA: 3:50pm On Jun 07, 2021
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Re: A Thread For Tutorial On Python Programming by Nasww22nasww: 8:34pm On Jun 07, 2021
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Re: A Thread For Tutorial On Python Programming by QueTeddy: 10:48am On Jun 15, 2021
mosco04:
I’m looking for a programmer to help me do something 30k every month for doing some assignment cause this programming of a thing is not my calling

If its in python, sure.
Re: A Thread For Tutorial On Python Programming by eodorpy: 7:29pm On Jun 15, 2021
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Re: A Thread For Tutorial On Python Programming by Michaelesoimeme(m): 3:57pm On Jun 16, 2021
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Re: A Thread For Tutorial On Python Programming by Michaelesoimeme(m): 7:23am On Jun 17, 2021
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Re: A Thread For Tutorial On Python Programming by abatechz(m): 6:56pm On Jun 28, 2021
it will still process itbut the only problem is when you want to decypher a particular type of error message.
Re: A Thread For Tutorial On Python Programming by bedfordng(m): 1:31pm On Jun 30, 2021
abatechz:
If you find mastering the code difficult, try the GUI program Tkinter It makes work easier when building desktop apps, I'm still trying to understand how it can be used for Web apps.
then get dirty with Django or flask for webapp. for me I will recommend Django if you can take the pains to learn it due to its features and premade admin panel.
Re: A Thread For Tutorial On Python Programming by yihaiwuya: 4:48am On Jul 02, 2021
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Re: A Thread For Tutorial On Python Programming by Luckybelt: 12:02am On Jul 03, 2021
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Re: A Thread For Tutorial On Python Programming by yihaiwuya: 8:00am On Jul 03, 2021
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Re: A Thread For Tutorial On Python Programming by sweet7oyin(m): 9:16am On Jul 03, 2021
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