Conditional import of modules in Python
I’ve seen this idiom used a lot, so you don’t even have to do OS sniffing: try: import json except ImportError: import simplejson as json
conditional-statements
Conditional Replace Pandas
.ix indexer works okay for pandas version prior to 0.20.0, but since pandas 0.20.0, the .ix indexer is deprecated, so you should avoid using it. Instead, you can use .loc or iloc indexers. You can solve this problem by: mask = df.my_channel > 20000 column_name=”my_channel” df.loc[mask, column_name] = 0 Or, in one line, df.loc[df.my_channel > … Read more
Are “elseif” and “else if” completely synonymous?
From the PHP manual: In PHP, you can also write ‘else if’ (in two words) and the behavior would be identical to the one of ‘elseif’ (in a single word). The syntactic meaning is slightly different (if you’re familiar with C, this is the same behavior) but the bottom line is that both would result … Read more
Why is the use of len(SEQUENCE) in condition values considered incorrect by Pylint?
When is the use of len(SEQ) as a condition value problematic? What major situations is Pylint attempting to avoid with C1801? It’s not really problematic to use len(SEQUENCE) – though it may not be as efficient (see chepner’s comment). Regardless, Pylint checks code for compliance with the PEP 8 style guide which states that For … Read more
Replace all elements of Python NumPy Array that are greater than some value
I think both the fastest and most concise way to do this is to use NumPy’s built-in Fancy indexing. If you have an ndarray named arr, you can replace all elements >255 with a value x as follows: arr[arr > 255] = x I ran this on my machine with a 500 x 500 random … Read more
How to use conditional statement within child attribute of a Flutter Widget (Center Widget)
Actually you can use if/else and switch and any other statement inline in dart / flutter. Use an immediate anonymous function class StatmentExample extends StatelessWidget { Widget build(BuildContext context) { return Text((() { if(true){ return “tis true”;} return “anything but true”; })()); } } ie wrap your statements in a function (() { // your … Read more
Laravel Checking If a Record Exists
It depends if you want to work with the user afterwards or only check if one exists. If you want to use the user object if it exists: $user = User::where(’email’, ‘=’, Input::get(’email’))->first(); if ($user === null) { // user doesn’t exist } And if you only want to check if (User::where(’email’, ‘=’, Input::get(’email’))->count() > … Read more
How to write a switch statement in Ruby
Ruby uses the case expression instead. case x when 1..5 “It’s between 1 and 5” when 6 “It’s 6” when “foo”, “bar” “It’s either foo or bar” when String “You passed a string” else “You gave me #{x} — I have no idea what to do with that.” end Ruby compares the object in the … Read more