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Python - 'ascii' codec can't decode byte
... you have invoked it on a string object (because you don't have the u). So python has to convert the string to a unicode object first. So it does the equivalent of
"你好".decode().encode('utf-8')
But the decode fails because the string isn't valid ascii. That's why you get a complaint about not...
Specifying an Index (Non-Unique Key) Using JPA
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= Specifications =
JPA 2.1+: javax.persistence.Index (or see JSR-000338 PDF, p. 452, item 11.1.23)
The JPA @Index annotation can only be used as part of another annotation like @Table, @SecondaryTable, etc.:
@Table(indexes = { @Index(...) })
JDO 2.1+: javax.jdo.annotations.Index
= ORM Framewo...
Comment out text in R Markdown (Rmd file)
...t because knitr is not responsible for rendering the document into html or pdf. I think the HTML comment characters are only dealt with by pandoc/rmarkdown after knitting.
– randy
Jul 12 '19 at 21:57
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ImportError: No module named PIL
...ve in fact installed PIL.
Having a different name for the library and the Python module is unusual, but this is what was chosen for (some versions of) PIL.
You can get more information about how to use this module from the official tutorial.
PS: In fact, on some installs, import PIL does work, wh...
How to call a Parent Class's method from Child Class in Python?
When creating a simple object hierarchy in Python, I'd like to be able to invoke methods of the parent class from a derived class. In Perl and Java, there is a keyword for this ( super ). In Perl, I might do this:
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How do I create a constant in Python?
Is there a way to declare a constant in Python? In Java we can create constant values in this manner:
41 Answers
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What does a b prefix before a python string mean?
In a python source code I stumbled upon I've seen a small b before a string like in:
2 Answers
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How to get current CPU and RAM usage in Python?
...getting current system status (current CPU, RAM, free disk space, etc.) in Python? Bonus points for *nix and Windows platforms.
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How do I parse XML in Python?
I have many rows in a database that contains XML and I'm trying to write a Python script to count instances of a particular node attribute.
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Convert two lists into a dictionary
...rwise dict constructor and zip function are awesomely useful: https://docs.python.org/3/library/functions.html#func-dict
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