🌐 Mailman 3 May 2020 - Tutor - python.org

Scripting Calligra sheets with Python
by Jim Byrnes Jan. 31, 2022

Jan. 31, 2022

I am trying to script Calligra Sheets (formerly KSpread) with python. I have gotten some of the included example scripts to run so I know python scripting is running. I found the following snippet on their website: import KSpread sheet = KSpread.view().sheet() # swap text of B5 and C6 t1 = sheet.text("B5") t2 = sheet.text(6,3) sheet.setText("B5", t2) sheet.setText(6, 3, t1) # swap value of D7 and E8 v1 = sheet.value("D7") v2 = sheet.value(8,5) sheet.setValue("D7", v2) sheet.setValue(8, 5, v1) Error: 'str' object has no attribute 'text' File "file:///usr/share/kde4/apps/sheets/scripts/extensions/myswap.py", line 4, in <module> This error message appeared in a dialog box. I've taught myself some Python but I don't understand what is happening here. Shouldn't t1 be a sheet object? What would cause it to be a str instead? Thanks, Jim

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Type annotation errors
by boB Stepp June 5, 2020

June 5, 2020

The following function yields type annotation errors and I do not understand why: def evaluate_portfolio( portfolio: List[Dict[str, Union[str, int, float]]], stock_prices: Dict[str, float] ) -> Tuple[float, float]: """Compute the current value and gain/loss of a portfolio.""" portfolio_value = 0.0 gain_loss = 0.0 for stock in portfolio: current_value = stock["shares"] * stock_prices[stock["name"]] current_gain_loss = current_value - (stock["shares"] * stock["price"]) portfolio_value += current_value gain_loss += current_gain_loss return portfolio_value, gain_loss The error messages generated are: report.py|47 col 43 info| Left operand is of type "Union[str, int, float]" report.py|47 col 43 error| Unsupported operand types for * ("str" and "float") report.py|47 col 56 error| Invalid index type "Union[str, int, float]" for "Dict[str, float]"; expected type "str" report.py|48 col 29 info| Both left and right operands are unions report.py|48 col 29 error| Unsupported operand types for - ("float" and "str") report.py|48 col 46 error| Unsupported operand types for * ("str" and "str") report.py|48 col 46 error| Unsupported operand types for * ("str" and "float") report.py|48 col 46 error| Unsupported operand types for * ("float" and "str") For reference line 47 is the line in the for loop beginning "current_value..." portfolio is a list of dictionaries where each dictionary is of the form {"name": "stock name", "shares": number_of_shares_owned, "price": price_per_share} The code runs flawlessly and gives the expected results. Where am I going wrong in my type annotations? -- Wishing you only the best, boB Stepp

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Odd & Even lists
by Mary Knauth May 31, 2020

May 31, 2020

Hello, I am working through a Python course, and I’m really stuck on working with lists. The script I am working on now is: Task: We are passing in a list of numbers. You need to create 2 new lists in your chart, then put all odd numbers in one list put all even numbers in the other list output the odd list first, the even list second Current code I am running: # Get our input from the command line import sys numbers = sys.argv[1].split(',') for i in range(0,len(numbers)): # 0 to the length of the list numbers[i]= int(numbers[i]) # creates a list of numbers and converts numberes to an integer # Modulo operator to decifer even numbers def isEven(n) : return ((n % 2) == 0) # n % 2 leaves no remainder, therefore even for i in range(numbers) if i == isEven: def listEven = [i] else: def listOdd = [i] print(listOdd) listOdd.append(i) print(listEven) listEven.append(i) Any advice in the right direction is appreciated, thank you! Warm Regards, Mary http://www.zephyrsolutions.us <http://www.zephyrsolutions.us/> <https://zephyrsolutions.us/>

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Selenium
by jet pistol May 29, 2020

May 29, 2020

Hi, I was trying to get a webscrapping script to work on my rapsberry, It worked fine on my Windows 10. I installed all modules, the chromium browser and the chromedriver. But this happens every time i try to launch the script on my rapsberry pi. I have no issues with all the modules import in python 3.8.3 pi@raspberrypi:~/bot $ python3.8 webpronote.py Traceback (most recent call last): File "webpronote.py", line 29, in <module> driver = webdriver.Chrome() File "/usr/local/lib/python3.8/site-packages/selenium/webdriver/chrome/webdriver.py", line 73, in __init__ self.service.start() File "/usr/local/lib/python3.8/site-packages/selenium/webdriver/common/service.py", line 72, in start self.process = subprocess.Popen(cmd, env=self.env, File "/usr/local/lib/python3.8/subprocess.py", line 854, in __init__ self._execute_child(args, executable, preexec_fn, close_fds, File "/usr/local/lib/python3.8/subprocess.py", line 1702, in _execute_child raise child_exception_type(errno_num, err_msg, err_filename) OSError: [Errno 8] Exec format error: 'chromedriver' Thanks for helping me out with chromedriver

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some problem, please help me
by Markzer May 28, 2020

May 28, 2020

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Partition in Windows or Linux
by Michael Kommenda May 28, 2020

May 28, 2020

Hello, Unfortunately, I couldn't find an answer to the FAQ. How to define a partition in Windows or Linux in Python 3? So e.g. "F:/" or "sda3"? I know a definition of a file, is there a special term for partitions? Thank you for your efforts Michael Kommenda

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Installation of pycharm
by Divya May 27, 2020

May 27, 2020

How do I install pycharm in windows 8.1? Can you suggest IDE other than pycharm?

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Chromedriver
by jet pistol May 27, 2020

May 27, 2020

Hi, I was trying to get a webscrapping script to work on my rapsberry, It worked fine on my Windows 10. I installed all modules, the chromium browser and the chromedriver. But this happens every time i try to launch the script on my rapsberry pi. I have no issues with all the modules import in python 3.8.3. I installed the arm7l version of chromedriver Traceback (most recent call last): File "webpronote.py", line 29, in <module> driver = webdriver.Chrome(executable_path='/usr/bin/chromedriver') File "/usr/local/lib/python3.8/site-packages/selenium/webdriver/chrome/webdriver.py", line 76, in __init__ RemoteWebDriver.__init__( File "/usr/local/lib/python3.8/site-packages/selenium/webdriver/remote/webdriver.py", line 157, in __init__ self.start_session(capabilities, browser_profile) File "/usr/local/lib/python3.8/site-packages/selenium/webdriver/remote/webdriver.py", line 252, in start_session response = self.execute(Command.NEW_SESSION, parameters) File "/usr/local/lib/python3.8/site-packages/selenium/webdriver/remote/webdriver.py", line 321, in execute self.error_handler.check_response(response) File "/usr/local/lib/python3.8/site-packages/selenium/webdriver/remote/errorhandler.py", line 242, in check_response raise exception_class(message, screen, stacktrace) selenium.common.exceptions.WebDriverException: Message: unknown error: Chrome failed to start: exited abnormally. (unknown error: DevToolsActivePort file doesn't exist) (The process started from chrome location /usr/bin/google-chrome is no longer running, so ChromeDriver is assuming that Chrome has crashed.) Thanks for helping me out with chromedriver

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Re: [Tutor] What is the Copy Parameter in the Pandas Series Method For
by YAW ANTWI-ADJEI May 26, 2020

May 26, 2020

I would like to know what difference the copy parameter in the Pandas Series() Method makes in the creation of a Series? For example: [image: image.png] I cannot see any difference between TestSeries1 and TestSeries2. In fact, I checked the *id* and they have different *id *as shown below: *>>> id(TestSeries1)* 135039368 >>> *>>> id(TestSeries2)* 63220056 So what actually does the copy argument do? Yaw

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Trigonometric Functions in Python
by April Morone May 26, 2020

May 26, 2020

I signed up for the ITP100 Software Design (Python Programming) class for this Summer. I have been working ahead through the book, but came across an issue with understanding something within Chapter 4 of the book "Python for Everybody: Exploring Data in Python 3" that is by the author Charles Severance on page 45. Please explain for me how the following checks the result of the conversion from degrees to radius to get 0.7071067811865476 to see if the result is correct: math.sqrt(2) / 2. of the following: >>> degrees = 45 >>> radians = degrees / 360.0 * 2 * math.pi >>> math.sin(radians) 0.7071067811865475 I never got to complete PreCalc w/Trig class (had to withdraw from it even though I had a C in it for several reasons, so this doesn't fully make sense to me, even though the formula itself to convert degrees to radians does make sense. The way to check results however, does not make sense to me. How does the following check the result of the above conversion from degrees to radius to see if the result is correct? >>> math.sqrt(2) / 2.0

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