Python drops 🐍💧

Flashcards for visual learners

Past tips

1. NotImplementedError
2. Set operations with operators
3. String formatting field alignment
4. Cycling over an iterable
5. NotImplemented
6. Safe random tokens
7. Decimals
8. Using fractions
9. Regex matches across newlines
10. Compute partial sums with accumulate
11. Reduce boilerplate with dataclasses
12. Alternative constructors as class methods
13. Read-only attributes
14. Strict batching
15. Class and instance attributes
16. Invertible flags
17. Find files in a directory
18. Efficiently count characters in a string
19. Efficiently count words in a string
20. Make numbers more readable
21. Prevent subclassing/overriding
22. pairwise generalisation
23. Remove punctuation functionally
24. Integer literals in multiple bases
25. Enforce positional arguments
26. Operate on two lists of numbers
27. Using properties
28. Ignore exceptions
29. Paginate results
30. All equal
31. Efficiently extending a list
32. Safely overriding methods
33. Dictionary creation idiom
34. Send data into generators
35. Double leading underscore
36. dict.fromkeys
37. Constant variables
38. Two-dimensional range
39. Type hints that refer to functions
40. Non-greedy regex quantifiers
41. Add typing to decorators
42. Dynamic module attribute look-up
43. map's keyword argument strict
44. Custom enum search behaviour
45. Dunder method __missing__
46. AST parsing
47. Typing *args and **kwargs
48. methods __str__ and __repr__
49. Pretty-printing nested data structures
50. Filtering Truthy values
51. Readable object names
52. Custom containment checks
53. Match word boundaries
54. Common __hash__ implementation
55. Docstring __doc__ attribute
56. Dynamic width string formatting
57. Non-local variables
58. Temporary directories
59. Timestamp file names
60. Preserving decorated function metadata
61. Natural alphabetical sorting
62. Constrained generics
63. Caching sets and frozen sets
64. File modes
65. Add lists together, fast
66. Generics syntax
67. Extracting text data into a dict
68. Verbose regular expressions
69. Structural validation and homogenisation
70. Bulk renaming files
71. Typing overloads
72. Undoable iterator with value history
73. Match an exact dictionary structure
74. Built-in next with a default value
75. Match the structure of custom objects
76. Peek at an iterable
77. Slicing generators for debugging
78. Structural pattern matching with dictionaries
79. File discovery by name pattern
80. Extract assignments from conditionals
81. Regex multiline flag
82. Split strings in two halves
83. Generator recipe
84. Concatenate files from handlers
85. Formatting dates with f-strings
86. Resolving paths
87. Named groups in regex
88. Formatting big numbers
89. One-shot file I/O
90. File tail
91. Idiomatic sequence slicing
92. Subclassing immutable types
93. Underscore in the REPL
94. Ergonomic multiline strings
95. Structural unpacking
96. t-strings need processing
97. Module itertools categorisation
98. Case-insensitive regular expressions
99. String constants
100. Dynamic regex replacements
101. Random choices
102. Redacting email addresses
103. Batching API calls
104. Dot product idiom
105. Counting values that satisfy a predicate
106. Format specifier !r
107. Read files in chunks
108. Bounded cache
109. Longest and shortest
110. OS-agnostic line splitting
111. Automatic enumeration values
112. Global enumeration members
113. Multi-dictionary
114. Typing iterables instead of lists
115. Inline lists and tuples
116. Transpose a list of lists
117. Normalise strings by removing accents
118. Most recently-modified file
119. Enumerations of string values
120. Return value of a generator
121. Use Literal for options
122. Flag enumerations
123. Enforce keyword arguments for options
124. Notify parent class when subclassing
125. Dynamic attribute manipulation
126. Longest word in a string
127. Chain multiple dictionaries
128. Set operations with dict.keys()
129. Current date and time
130. Dunder attribute __file__
131. Self-debugging f-strings
132. Immutable dictionary
133. Create context managers with contextlib.contextmanager
134. Type statements
135. Round to pretty whole numbers
136. Multiple options in a single case statement
137. String prefixes and suffixes
138. Run-length encoding
139. Count characters in a file
140. Remove punctuation from a string
141. map with multiple arguments
142. Schedule cleanup actions
143. Unique elements from a list
144. Last element that satisfies a condition
145. First element that satisfies a condition
146. Parsing integers from different bases
147. Type unions with the vertical bar in isinstance
148. Case-insensitive string comparisons
149. zip's keyword argument strict

Refer readers, access the tip backlog

The mathspp drops 🐍💧 newsletter is free. That's 5 tips per week, for free.

If you refer your friends and colleagues to the mathspp drops 🐍💧 newsletter, you can earn rewards. For example, you can earn access to the backlog of tips (started on the 4th of March of 2025), which is available as an e-book and as a set of flashcards.

To refer friends, check the instructions on the bottom of every tip email you receive.