thinkpython | think python : how to think like a computer scientist 中文翻译 | Learning library

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thinkpython is a Shell library typically used in Tutorial, Learning applications. thinkpython has no bugs, it has no vulnerabilities and it has low support. You can download it from GitHub.

think python:how to think like a computer scientist 中文翻译

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Community Discussions

Trending Discussions on thinkpython

Hyperbolic Spirals (first time learning with ThinkPython)

Section 4.3 Exercise #5 - "Think Python" by Allen Downey

While loop runs differently after the first loop

Why is + operator much slower than append() when creating a list?

Python: Unable to add minutes to give time

How does the following Python line exactly work? d.setdefault(c.suit, PokerHand()).add_card(c)

Tango with Django (v1.9/1.10) - Chapter 5, populate_rango issues

Think Python - Exercise 4.3 #2

Django ImportError: No module named tango_with_django_project.settings

QUESTION

Hyperbolic Spirals (first time learning with ThinkPython)

Asked 2020-May-01 at 19:57

I'm learning Python (for fun) through the book ThinkPython. So far I'm really enjoying this new hobby. One of the recent exercise was crafting a Archimedes spiral.In order to test my skills I've been working on making a hyperbolic spiral but have been stumped!

according to the equation r=a+b*theta^(1/c)

when c=1 we see a Archimedes spiral
when c=-1 we should see a hyperbolic spiral

I'm using the following code and would appreciate any help towards the right direction.

Extra points to whoever can help me in the right direction without directly giving away the answer. Unless it's simply a formatting issue.
No points if the answer suggested involves using (x,y) coordinates to draw.

...

ANSWER

Answered 2020-May-01 at 05:51

Simply adjusting the constants passed to draw_spiral() as arguments:

Source https://stackoverflow.com/questions/61533400

QUESTION

Section 4.3 Exercise #5 - "Think Python" by Allen Downey

Asked 2019-Dec-30 at 22:21

Link to the Exercises can be accessed here - Case Study: Interface Design, Exercise Section 4.3

Quoting the question, it seems I have to implement an arc() function:

Make a more general version of circle called arc that takes an additional parameter angle, which determines what fraction of a circle to draw. angle is in units of degrees, so when angle=360, arc should draw a complete circle.

The code I've written so far:

...

ANSWER

Answered 2018-Oct-11 at 18:23

I'm trying to ... call the circle() function within arc() just as polygon() was called within circle()

You've got this backward. The problem states:

Make a more general version of circle called arc

Just as you could draw a circle with the more general function polygon(), you should be able to draw a circle with the more general function arc(). Here's a skeletal program for thinking about this:

Source https://stackoverflow.com/questions/52763902

QUESTION

While loop runs differently after the first loop

Asked 2019-Jun-17 at 00:21

Doing this exercise from ThinkPython and wanting to do a little extra, trying to modify the exercise function (avoid) to prompt the user repeatedly and perform the calculation to find how many words in a text file (fin) contain the user inputted letters (avoidprompt). It works the first time but after it prompts the user for input again it always returns an answer of 0 words.

Feel like the most likely issue is I'm misunderstanding how to use the while loop in this context since it works the first time but doesn't after that. Is there a better way?

...

ANSWER

Answered 2019-Jun-17 at 00:21

When you open a file and do for line in file, you've consumed the entire file.

There are two easy solutions:

1) Go back to the start of the file in each iteration of your while(True) loop, by doing fin.seek(0)

2) Just store the file contents in a list, by replacing the first line of your script with fin = open('file.txt').readlines()

Source https://stackoverflow.com/questions/56623402

QUESTION

Why is + operator much slower than append() when creating a list?

Asked 2019-Feb-07 at 07:02

(I muddled up the question in the beginning, sorry lol long day.) I'm pretty much a beginner learning to code in python using the thinkpython pdf. One of the questions asked is to write a function to build a word list using append and t = t+[x]. According to my results, append is significantly faster, but I don't have a clue why.

...

ANSWER

Answered 2019-Feb-07 at 07:02

The + operation adds another element to the original array. The append operation inserts the array or object into the end of the original array, which results the append uses less memory.

Source https://stackoverflow.com/questions/54562224

QUESTION

Python: Unable to add minutes to give time

Asked 2018-Sep-27 at 11:25

I am trying to add minutes to another timestamp. My code looks like below

...

ANSWER

Answered 2018-Sep-27 at 11:24

Change

Source https://stackoverflow.com/questions/52535828

QUESTION

How does the following Python line exactly work? d.setdefault(c.suit, PokerHand()).add_card(c)

Asked 2017-Oct-27 at 09:50

It's the last piece of code I cannot grasp from the official solution for the PokerHand exercise from ThinkPython book:

card.py

and

PokerHandSoln.py

...

ANSWER

Answered 2017-Oct-27 at 09:50

dict.setdefault() returns the value for the given key (having optionally set a default value first, if the key is missing).

The d.setdefault(c.suit, PokerHand()).add_card(c) expression makes sure there is a value for the c.suit key, and returns that. The default is PokerHand(), an instance of a class that defines the add_card() method.

Split it out into two statements, if that makes it easier to read:

Source https://stackoverflow.com/questions/46972068

QUESTION

Tango with Django (v1.9/1.10) - Chapter 5, populate_rango issues

Asked 2017-Sep-24 at 18:00

I will try to be concise. The background for this issue is that I'm familiar with Python, however I am BRAND NEW to django. This book is my first exposure to it and I've come to find the more I work through the book that online Q/A's for django are not very general, thus making it harder to "just google it" and find an answer.

Resource: Tango with Django (for version 1.9/1.10)
Distro: Elementary OS, Patched to the latest
Python Version: 3.5
Django Version: 1.11.x

What Is my Error: django.core.exceptions.FieldError
What are the Details: Invalid field name(s) for model Page: 'category'.
What does the Error mean?: Per The Docs, This error is raised when there is a problem with a field inside a model..Of the reasons listed The following look relevant to my issue:

An infinite loop is caused by ordering.

I have verified the the order in which the fields are declared in the model is consistent with how the add_page. as well, I have debugged my code and see that all the fields appear to be correct as they pass through the various functions. however I'm thinking perhaps [this] is might be the issue. I think the work 'category' is somehow referencing the category class? total troubleshooting conjecture.

A Feild name is invalid

It's always something simple, I've checked this out and the naming and usage of variables is consistent throughout the code. I've also double checked my code against the book. Everything seems in order, the code just isn't working.

The Traceback

...

ANSWER

Answered 2017-Sep-24 at 18:00

class Page(models.Model):
    Category = models.ForeignKey(Category)

Source https://stackoverflow.com/questions/46331620

QUESTION

Think Python - Exercise 4.3 #2

Asked 2017-Jul-13 at 18:00

These are the questions. I successfully completed Question 1 but I am just adding it for context. I am having trouble with Question 2.

...

ANSWER

Answered 2017-Jul-13 at 17:55

Because bob is an instantiation of the Turtle class and fd is a class function, there is an implicit self passed when the function is called. If you were to look at the definition for fd in the Turtle class, you would see something like def fd(self, distance). When calling the class function bob.fd(t, length), the self argument is passed with the instantiation of the class implicitly, and then you are passing 2 additional arguments (t,length), for a total of 3 arguments.

Source https://stackoverflow.com/questions/45087562

QUESTION

Django ImportError: No module named tango_with_django_project.settings

Asked 2017-Jan-27 at 15:05

From near the end of chapter 5 in the Tango With Django tutorial book, I have created a script used to populate a SQLite database with test data which is called:
~/Workspace/wad2/tango_with_django_project/populate_rango.py
After receiving an error, I tried directly copy-pasting the script from the book and still received the following errors:

...

ANSWER

Answered 2017-Jan-27 at 15:05

In order for your Django project to load the settings as tango_with_django_project.settings, wad2 needs to be on the Python path.

The easiest fix is to move populate_rango.py up a directory from wad2/tango_with_django_project/ to wad2.

Alternatively, you can add the parent directory to the python path in populate_rango.py

Source https://stackoverflow.com/questions/41893837

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