By Jeff Knupp
Write. Idiomatic. Code.
Get pythonic from the beginning: concise advisor to idiomatic code; most sensible after one other textual content, yet matches a few courageous newcomers.
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Python has two oft-overlooked built-in functions, chr and ord, that are used to perform these translations. 1 Harmful hash_value = 0 character_hash = { 'a': 97, 'b': 98, 'c': 99, # ... 4 Prefer the format function for formatting strings There are three general ways of formatting strings (that is, creating a string that is a mix of hard-coded strings and string variables). Easily the worst approach is to use the + operator to concatenate a mix of static strings and variables. Using “old-style” string formatting is slightly better.
The bare raise re-raises the exception that was caught. This way, your code runs and the user still gets useful information when something goes wrong. Of course, there are valid reasons one would need to ensure some block of code never generates an exception. Almost none of the idioms described in this book are meant to be mechanically followed: use your head. json() # If we need to make note of the exception, we # would write the function this way... json() except: # do some logging here, but don't handle the exception # ...
It’s also an idiom that sounds obvious when you hear or see it, but is not something those new to the language typically divine on their own. attributes that do not require an instance of the class to be referred to). For example, it’s common for ORM’s like SQLAlchemy to require model classes to define a __tablename__ attribute. Given a Blog model class, the value of __tablename__ may be blog. __tablename__. Doing so can create problems in derived classes. __tablename__, calling the method on any class derived from Blog would return blog rather than the derived class’s __tablename__.