Tag: Python
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Get Python help, one on one: my coaching sessions
Some of the most satisfying work I do happens one on one. You arrive with a real problem from your real job — code that will not behave, an architecture you are unsure about, a Git situation that has you stuck — and an hour later it is smaller, or gone. I have offered these…
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np.nan in Pandas: Why missing values break comparisons
Missing data in Python Pandas? We use nan (“not a number”), which comes from NumPy. np.nan is a float, but not a normal one:
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Python callables: Any object that defines __call__
What is a “callable” in Python? Typically, a function or class. But really, it’s anything with __call__ defined: The “callable” builtin basically returns True if it finds __call__.
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Python += calls __add__ and rebinds to a new object
If you invoke +=, Python can use __add__. MyClass implements __add__ (calling print for debugging): m1 now refers to a new object, and its repr is: MyClass instance, vars(self)={‘x’: 30}
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Python in operator: How __contains__ speeds up membership tests
How does the “in” operator work in Python? – If an object defines __contains__, then its (boolean) result is returned (coerced to bool).– If not, then Python iterates over it with __iter__ Can you find and return a result faster than __iter__? Then define __contains__.
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Newsprint: Turning e-mail newsletters into a personal PDF
I really enjoy reading e-mail newsletters. They’re clever, informative, and funny, and provide me with lots of food for thought — as well as professional information that is crucial to my work. The thing is, I don’t have time to read them during the week. And on Saturday, when I do have time, I don’t…
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Python | operator: Bitwise or and dict merging with __or__
In Python, we use “or” for conditions. | is bitwise (not boolean) “or”: x | y # 15, or 0b1111 | runs __or__. On dicts, | combines.
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Python `__mod__`: Modulo for numbers, interpolation for str
The % in Python, on numbers, is modulo: But str uses __mod__ for interpolation: Same operator, same magic method — but totally different.
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Python operator overloading: The arithmetic magic methods
Just as + in Python invokes __add__, other operators invoke other magic methods: • – is __sub__• * is __mul__• / is __truediv__• // is __floordiv__• % is __mod__• ** is __pow__ Your methods can do whatever you want. But do try to stick to conventional expectations.
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Claude Code always produces something. That’s the hard part.
I’ve been using Claude Code several hours a day for months, and I’m having a blast. But an agent does what you tell it, not what you meant — which is why validating your results now matters more than the results themselves.