Recent questions tagged Python

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python - When to open file in binary mode (b)?

I noticed in the docs they always open a CSV file with wb'. Why the b'? I know b stands for binary ... file. What does including the + do? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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python - PDF output using Weasyprint not showing images (Django)

I am trying to output PDF on Django using the Weasyprint library, but the images don't appear on the generated ... 1111px;} Thank you very much See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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python 3.x - ValueError: Expected 2D array, got 1D array instead:

While practicing Simple Linear Regression Model I got this error, I think there is something wrong with my data ... .predict(x_test) Thank you See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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python - What is the easiest way to convert list with str into list with int?

What is the easiest way to convert list with str into list with int in Python? For example, we have to convert ['1 ... loop, but it's too easy. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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python - Define remote interpreter on remote Linux machine using Pydev and RSE Server

I have a Windows box and a Linux red hat box. Eclipse is installed on Windows, following instructions given on ... a PyDev or Django project? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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257 views

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python - Why can I only use the await keyword inside of async function?

Suppose I have code like this async def fetch_text() -> str: return "text " async def show_something(): something = ... . Is there a better way? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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python - Case insensitive pandas dataframe.merge

I am struggling with the easiest way to do a case insensitive merge in pandas. Is there a way to do it right on the ... NAME", how="left") .... See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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python - Can't install time module

I've tried pip install time and sudo -H pip install time, but I keep getting the error: Could not find a ... Console but not in my actual code. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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357 views

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python - Specify correct dtypes to pandas.read_csv for datetimes and booleans

I am loading a csv file into a Pandas DataFrame. For each column, how do I specify what type of data it contains ... .int64, 'B': np.float64}) See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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python - how to catch specific pyodbc error message

I trid the following code, import pyodbc try: pyodbc.connect('DRIVER={%s};SERVER=%s;DATABASE=%s;UID=%s;PWD= ... the message in the error. Thanks See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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350 views

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python - Pyspark - converting json string to DataFrame

I have a test2.json file that contains simple json: { "Name": "something", "Url": "https:// ... PySpark3 Kernel. Thanks in advance. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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python - Can I assign values in RowProxy using the sqlalchemy?

When I want to display some data in the web, the data need makeup, and I don't know how to achieve, here ... and not contains the column 'Tags'. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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450 views

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python - pick combinations from multiple lists

I am new to python and I am struggling to form a combination of multiple lists. So, I have three (and ... original lists (in this case 3) See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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180 views

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python - How does __call__ actually work?

Python's magic method __call__ is called whenever you attempt to call an object. Cls()() is thus equal ... __call__ actually execute the code? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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225 views

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python - Split tuple items to separate variables

I have tuple in Python that looks like this: tuple = ('sparkbrowser.com', 0, 'http://facebook.com/ ... tuple doesn't have split option. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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242 views

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python - Choosing random items from a Spark GroupedData Object

I'm new to using Spark in Python and have been unable to solve this problem: After running groupBy on a ... groupBy is wrong to start with? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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434 views

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python - uwsgi + nginx + flask: upstream prematurely closed

I created an endpoint on my flask which generates a spreadsheet from a database query (remote db) and then sends it ... or uwsgi issue, or both? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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631 views

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python 3.x - AttributeError: 'module' object has no attribute 'maketrans'

I've been doing some previous research about this error. There are some explanations here in StackOverflow related, the ... how to handle this. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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288 views

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python - Django Rest Framework ListField and DictField

I am having struggle with understanding ListField and DictField. I want to use it as a field on a serializer. I ... django-rest-framework 3.3.3 See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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129 views

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python - Fetching a random record from the Google App Engine Datastore?

I have a datastore with around 1,000,000 entities in a model. I want to fetch 10 random entities from this. I ... to do this? can someone help? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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402 views

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python - How to pass a parameter to Scikit-Learn Keras model function

I have the following code, using Keras Scikit-Learn Wrapper, which work fine: from keras.models import Sequential from ... right way to do it? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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274 views

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python - Constructing the largest number possible by rearranging a list

Say I have an array of positive whole integers; I'd like to manipulate the order so that the concatenation of the ... 'm not sure of an answer. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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160 views

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python - Reduce function with three parameters

How does reduce function work in python3 with three parameters instead of two. So, for two, tup = (1,2,3 ... the third argument is not inserted? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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201 views

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python - What is the difference between "range(0,2)" and "list(range(0,2))"?

Need to understand the difference between range(0,2) and list(range(0,2)), using python2.7 Both return a list so what exactly is the difference? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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422 views

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python - KeyError when plotting a sliced pandas dataframe with datetimes

I get a KeyError when I try to plot a slice of a pandas DataFrame column with datetimes in it. Does anybody ... .c:2460)() KeyError: 0 See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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382 views

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python - Matplotlib histogram with multiple legend entries

I have this code that produces a histogram, identifying three types of fields; "Low", "medium" , and "high ... for the three different colors? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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154 views

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python - List comprehensions splitting loop variable

I am trying to find out if there is a way to split the value of each iteration of a list comprehension ... faster than the naive solution above. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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555 views

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python - How to get month and year from Date field in sqlalchemy?

The result should be Date object Since the day cannot be 'removed', set it to say, 1st day of the month. Leaving only Month, Year See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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