subject:"a question"

Re: A question about import

2024-02-16 Thread Cameron Simpson via Python-list


On 16Feb2024 20:32, MRAB  wrote:

On 2024-02-16 20:07, Gabor Urban via Python-list wrote:

I need something about modules to be clarified.

Suppose I have written a module eg: ModuleA which imports an other
module, let us say the datetime.

If I import ModuleA in a script, will be datetime imported automatically?


Yes. When a module is imported it can import other modules.


But note that `datetime` does not magicly get put in the script's 
namespace.


Module A:

import datetime

Script:

import A

In the code in module A the name datetime is known and can be used.

In the code in the script the name A is known and can be used. Importing 
A does not magicly set the name datetime in the script's namespace - 
imagine the the pollution!


You _can_ access it as A.datetime because it is in the A module's 
namespace. But really if you just wanted datetime for direct use in the 
script you would import it there too:


import datetime
import A

Note that the datetime module is only actually loaded once. The import 
binds the name into your local namespace like any other variable.


Cheers,
Cameron Simpson 
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Re: A question about import

2024-02-16 Thread MRAB via Python-list


On 2024-02-16 20:07, Gabor Urban via Python-list wrote:

Hi guys,

I need something about modules to be clarified.

Suppose I have written a module eg: ModuleA which imports an other
module, let us say the datetime.

If I import ModuleA in a script, will be datetime imported automatically?


Yes. When a module is imported it can import other modules.
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A question about import

2024-02-16 Thread Gabor Urban via Python-list

Hi guys,

I need something about modules to be clarified.

Suppose I have written a module eg: ModuleA which imports an other
module, let us say the datetime.

If I import ModuleA in a script, will be datetime imported automatically?

Thanks in advance,

--
Urbán Gábor

Linux is like a wigwam: no Gates, no Windows and an Apache inside.
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Re: New to python - Just a question

2020-07-03 Thread Tim Chase

On 2020-07-03 10:09, Daley Okuwa via Python-list wrote:
> Write an algorithm (choose the language you prefer) that given a
> character string, for instance {‘c’,’a’,’i’,’o’,’p’,’a’}, will
> print out the list of characters appearing at least 2 times. In
> this specific example, it would return {‘a’}. Afterwards, comment
> out the cost in terms of space and time.

What have you tried already?  Where are you having trouble?

Have you written a program that accepts a character string?  Is the
string coming in as a command-line argument or on standard-input?

The example string you give looks more like some sort of
serialization format rather than a string.

Are you having difficulty counting the letters?  Python provides a
"dict()" type that would work well.

Should uppercase letters be counted the same as lowercase letters?
I.e., should "Pop" report that there are 2 "p"s?

If you've counted the duplicates, 

Have you studied space/time complexity and do you know how to
evaluate code for these characteristics?  The problem should be
solvable in roughly O(k) per word.

> Write a bash/python script that takes a directory as an argument
> and output the total lines of code in *.cpp files recursively.

Again, what have you tried?

Have you been able to iterated over a directory? See find(1) or ls(1)
or grep(1) in a shell-script or os.listdir()/os.scandir()/glob.glob()
in Python

Have you been able to open those files?

Can you iterate over the lines in each file?

Do you need to filter out any lines (such as blank lines or comments)?

If you provide what you've tried, folks here on the list are pretty
happy to help.  But most won't do your homework for you.

-tkc

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Re: New to python - Just a question

2020-07-03 Thread Rhodri James

On 03/07/2020 11:09, Daley Okuwa via Python-list wrote:

Please can someone help

Write an algorithm (choose the language you prefer) that given a character
string, for instance {‘c’,’a’,’i’,’o’,’p’,’a’}, will print out the list of
characters appearing at least 2 times. In this specific example, it would
return {‘a’}. Afterwards, comment out the cost in terms of space and time.

The first thing to do with any problem is to break it down into bits.
In the case of Python, writing them out as "pseudo-code" instructions
often helps. In this case you have:

Set up something to count letters with
For each letter in the string:
If we haven't seen this letter before:
Set the counter for the letter to 1
Else:
Add 1 to the counter for the letter

For each counter:
If the count is 2 or more:
Print the letter

Now there are a lot of possible ways to write that, but they mostly come
down to deciding what data structure to use to count letters with. Have
a browse through a tutorial (or the standard library if you are feeling
adventurous) and see what you think might work, then try it.

Write a bash/python script that takes a directory as an argument and output the
total lines of code in *.cpp files recursively.

In bash, what existing commands count things? If you don't know, how
might you find out? Then you have to figure out how to do that for each
*.cpp file in a directory, and add the totals together.

In Python, you can read a file one line at a time, so how to count the
number of lines in a file should be pretty obvious. Figuring out how to
do that for every *.cpp file in a directory will involve looking through
the standard library, or getting a bash script to do it for you :-)

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