Python

Dictionary
Check key exists in dictionary dict: if key in dict:
How to iterate: a good tutorial.
String
Trimming:
1
s = s.strip()
2
s = s.lstrip()
3
s = s.rstrip()
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Replace:
1
s = s.replace('\t', ' ')
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Debug
str vs repr: https://www.geeksforgeeks.org/str-vs-repr-in-python/, https://stackoverflow.com/questions/1436703/difference-between-str-and-repr.

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Fluent Python

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Dictionary

String

Debug