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Is there a decorator to simply cache function return values?
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Starting from Python 3.2 there is a built-in decorator:
@functools.lru_cache(maxsize=100, typed=False)
Decorator to wrap a function with a memoizing callable that saves up to the maxsize most recent calls. It can save time when an expen...
How can I generate an INSERT script for an existing SQL Server table that includes all stored rows?
...E(so.schema_id)
where table_name = so.name
order by ordinal_position
FOR XML PATH('')) o (list)
cross apply
(SELECT '''+' +case
when data_type = 'uniqueidentifier' THEN 'CASE WHEN [' + column_name+'] IS NULL THEN ''NULL'' ELSE ''''''''+CONVERT(NVARCHAR(MAX),[' + COLUMN_NAME + '])+''''''''...
How to use PyCharm to debug Scrapy projects
I am working on Scrapy 0.20 with Python 2.7. I found PyCharm has a good Python debugger. I want to test my Scrapy spiders using it. Anyone knows how to do that please?
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Correct way to pause Python program
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Seems fine to me (or raw_input() in Python 2.X). Alternatively you could use time.sleep() if you want to pause for a certain number of seconds.
import time
print("something")
time.sleep(5.5) # pause 5.5 seconds
print("something")
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Converting ISO 8601-compliant String to java.util.Date
...AXB, since JAXB must be able to parse ISO8601 date string according to the XML Schema specification. javax.xml.bind.DatatypeConverter.parseDateTime("2010-01-01T12:00:00Z") will give you a Calendar object and you can simply use getTime() on it, if you need a Date object.
You could probably use Joda-...
What is the most efficient way to loop through dataframes with pandas? [duplicate]
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BTW itertuples returns named tuples ( docs.python.org/3/library/…) so you can access each column by name with row.high or getattr(row,'high')
– seanv507
Apr 17 '16 at 18:51
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How to create a tuple with only one element
... make them tuples. You have to add a comma after the string to indicate to python that it should be a tuple.
>>> type( ('a') )
<type 'str'>
>>> type( ('a',) )
<type 'tuple'>
To fix your example code, add commas here:
>>> a = [('a',), ('b',), ('c', 'd')]
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Python date string to date object
How do I convert a string to a date object in python?
7 Answers
7
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csv.Error: iterator should return strings, not bytes
... best practices around it. I do that fairly consistently. If you're new to Python, and you get stuck in an interactive session with a file you can't do anything with, you would have appreciated my advice...
– Aaron Hall♦
Mar 9 '19 at 13:04
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How to get line count of a large file cheaply in Python?
...ed to get a line count of a large file (hundreds of thousands of lines) in python. What is the most efficient way both memory- and time-wise?
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