My code throws up syntax error on trying to download data from NYSE site get request functions.
I have changed the format of url string yet the error reappeared.
def get_decade(start=1920, end=1929, extension='prn'):
try:
link = requests.get(f"https://www.nyse.com/publicdocs/nyse/data/Daily_Share_Volume_{start}-{end}.{extension}")
file = os.path.join("..","Data", f"Daily_Share_Volume_{start}-{end}.{extension}")
if link.status_code ==404:
raise
else:
with open(file, "w") as temp_file:
temp_file.write(str(link.content.decode("utf-8")))
print(f"Successfully downloaded {start}-{end}")
except:
print("There was an issue with the download. \n\
You may need a different date range or file extension. \n\
Check out https://www.nyse.com/data/transactions-statistics-data-library")
The error message upon calling the function.
link = requests.get(f"https://www.nyse.com/publicdocs/nyse/data/Daily_Share_Volume_{start}-{end}.{extension}")
^
SyntaxError: invalid syntax
Resolution that will clear the invalid syntax error.
Source
As of Python 3.6, f-strings are a great new way to format strings.
You stated in a comment that
I know how to retrieve the file. I 'm using Python 3.5
In other words, upgrade your Python version or don't use f-strings.
Related
I am connected to an Excel application and can execute the "Debug"->"Compile VBAProject" from my Python code using win32com like so (inspired by code from here):
from win32com import client
def compile(self):
self.__excel = client.GetActiveObject("Excel.Application")
compile_button = self.__excel.VBE.CommandBars.FindControl(1, 578)
compile_button.Execute()
If there is a compilation error in the Excel VBA code I get a popup message in Excel telling me the error just fine.
Now I would like to check from the Python code if there was a compilation error and raise an exception if there was. I don't necessarily need the compilation error to be part of the exception but if that were possible I would of course gladly take that, too.
Can this be done somehow?
I've been experimenting with all kinds of window counts before and after the compilation etc. but so far have not found a property of any object that would indicate that there was a popup or a compilation error.
Ok, I found a somewhat ugly but doable way - that I would like to document for others having the same issue:
You need to import a code file into the opened Excel file that has (at least) one function defined. Then you can call this function from your Python code and catch any exception. If there was an exception your code - including the imported file - did not compile, if there is none the compilation was pass.
Here's my code:
compile_code.bas
Public Sub compileCode()
' doesn't need to do anything, it just needs to be available!
End Sub
Python file
from win32com import client
def compile(self) -> bool:
self.__excel = client.GetActiveObject("Excel.Application")
self.__book = self.__excel.ActiveWorkbook
self.__book.VBProject.VBComponents.Import(<Path_to_compile_code.bas>)
try:
self.__excel.Application.Run("compileCode")
# if you reach here the code compiled
return True
except Exception:
return False
I need some help with my code, because I cannot understand why is giving to me this error (sqlite3.OperationalError: near ".": syntax error).
I want to export a database.db to database.csv from Python, and this code works fine on sqlite3, but when I typed on Python3 with cur.execute() this error appears.
Now this is my code where the bug is
fname = input('Name for the csv?\n> ')
cur.execute('.headers on')
cur.execute('.mode csv')
cur.execute(f'.output {fname}.csv')
I searched on other forums but I think that this is a particular case.
I hope somebody can help me fixing the error, or giving me an alternative way to export the database to csv with python.
You can't do that. These commands work only within the sqlite executable and can't be used like regular SQL commands or pragrmas. What you could do in Python is run a shell command.
Well, I've got the need of automate a process in my job(actually I'm an intern), and I just wondered if I could use Python for such process. I'm still processing my ideas of how to do those stuffs, and now I'm currently trying to understand how to download a file from a web URL using python3. I've found a guide on another website, but there's no active help there. I was told to use the module requests to download the actual file, and the module re to get the real file name.
The code was working fine, but then I tried to add some features like GUI, and it just stopped working. I took off the GUI code, and it didn't work again. Now I have no idea of what to do to get the code working, pls someone helo me, thanks :)
code:
import os
import re
# i have no idea of how this function works, but it gets the real file name
def getFilename(cd):
if not cd:
print("check 1")
return None
fname = re.findall('filename=(.+)', cd)
if len(fname) == 0:
print("check 2")
return None
return fname[0]
def download(url):
# get request
response = requests.get(url)
# get the real file name, cut off the quota and take the second element of the list(actual file name)
filename = getFilename(response.headers.get('content-disposition'))
print(filename)
# open in binary mode and write to file
#open(filename, "wb").write(response.content)
download("https://pixabay.com/get/57e9d14b4957a414f6da8c7dda353678153fd9e75b50704b_1280.png?attachment=")
os.system("pause")```
I tried to do the following :
I have read a code in base64 via QR Code and then I converted it.
If I get an error while I do the convert, I will write a error variable to 1 and then continue without exiting the program.
I don't find a solution for me. Did anyone has an idea how I can handle it?
I tried it with the Python Try Command but I didn't get it working or I have done something wrong.
here is a snip of my code:
secure = base64.b64decode(secure_base).decode("utf-8", "ignore")
number = base64.b64decode(number_base).decode("utf-8", "ignore")
start = int(base64.b64decode(start_base).decode("utf-8", "ignore"))
end = int(base64.b64decode(end_base).decode("utf-8", "ignore"))
thanks a lot.
You can use the try and Except in python in the following manner.
try:
"""some intelligent program here, which some times may FOOBAR"""
except Exception as e:
error_recieved = e
"""Do whatever you want here incase of an error"""
Remember that the program in try skips to except just after the line in which the error/exception occured.
I am extracting data from netCDF files with Python code. I need to check if the netCDF files are in agreement with the CORDEX standards (CORDEX is a coordinated effort to carry modelling experiments with regional climate models). For this I need to access an attribute of the netCDF file. If the attribute is not found, then the code should go to the next file.
A snipet of my code is as follows:
import netCDF4
cdf_dataset = netCDF4.Dataset(file_2read)
try:
cdf_domain = cdf_dataset.CORDEX_domain
print(cdf_domain)
except:
print('No CORDEX domain found. Will exit')
....some more code....
When the attribute "CORDEX_domain" is available everything is fine. If the attribute is not available then the following exception is raised.
AttributeError: NetCDF: Attribute not found
This is a third party exception, which I would say should be handled as a general one, but it is not, as I am not able to get my "print" inside the "except" statement to work or anything else for that matter. Can anyone point me the way to handle this? Thanks.
There is no need for a try/except block; netCDF4.Dataset has a method ncattrs which returns all global attributes, you can test if the required attribute is in there. For example:
if 'CORDEX_domain' in cdf_dataset.ncattrs():
do_something()
You can do the same to test if (for example) a required variable is present:
if 'some_var_name' in cdf_dataset.variables:
do_something_else()
p.s.: "catch alls" are usually a bad idea..., e.g. Python: about catching ANY exception
EDIT:
You can do the same for variable attributes, e.g.:
var = cdf_dataset.variables['some_var_name']
if 'some_attribute' in var.ncattrs():
do_something_completely_else()