Write better Python code in the future.
Part 3 of our snippets and learning moments in Python.
Topics I recently remembered or picked up. Here is the recollection of all this posts:
The process of solving a bug/error which takes up to 75% of your time.
Master debugging to master scripting.
"Frame: " + 1001 # Traceback (most recent call last): # File "/server/week_05.py", line 32, in <module> # "Frame: " + 1001 # TypeError: cannot concatenate 'str' and 'int' objects # EXPLAIN # [EXCEPTION] Code stops and the traceback prints out the interpreter issue # [WHERE] file path, line 32, module # [WHAT] TypeError: cannot concatenate 'str' and 'int' objects # Cannot combine (+) a string and an integer
SAME LINE STATEMENTS
Semicolons can be used to delimit statements (see C++, MEL, ...)
when you must put multiple statements in the same line.
# idiomatic print("test") print("works too") # delimit statement print("test"); print("works too") # WARNING: Bad style!!! # USE CASE: UI button commands # A call needs to be converted into a multi statement string # cmds.button(label="Start Tool", command="import tool; tool.start()")
Get the index and value of a sequence.
assets = ['mike', 'sulley', 'camera'] enum_assets = enumerate(assets) # [(0, 'mike'), (1, 'sulley'), (2, 'camera')] for index, value in enum_assets: assets[index] = value + '_001'
Return multiple values (e.g. enumerate).
def get_type_task(file_name): file_split = file_name.split('_') return file_split, file_split file_name = 'char_mike_RIG_v001.ma' group, asset = get_type_task(file_name)
Limit a sequence with seq[first:last].
# slice list assets = ["mike", "sulley", "announcer", "table"] assets[1:3] # ['sulley', 'announcer'] # slice string character = "mike_001" character[-3:] # 001
Opens anything in your default browser or OS.
import webbrowser # WEBSITE webbrowser.open("https://www.alexanderrichtertd.com") # IMG & VIDEOS webbrowser.open("/server/image.png") webbrowser.open("/server/video.mp4") # SCRIPTS | LOGS | ... webbrowser.open("/server/script.py") # DIRECTORIES webbrowser.open("/server/project")
"" vs ''
There is no difference between double and single quotes but we careful mixing them.
# ERROR: without escape characters print("Are you really a "Superhero"?") # Typical: Integrate "" in '' print('Are you really a "Superhero"?') # Are you really a "Superhero"? # Or integrate '' in "" print("Are you really a 'Superhero'?") # Are you really a 'Superhero'?
Backslash (\) allows escape characters with special meaning
e.g. newline (\n), backslash (\\), quote (\' or \")
# ERROR: without escape characters print("Are you really a "Superhero"?") # Alternative: Mixing '' and "" print('Are you really a "Superhero"?') # Quotations print('Are you really a \'Superhero\'?') print("Are you really a \"Superhero\"?") # Add newline between two sentences # n is an escape character and will not be displayed as \n print("Hello?\nCan you read this?") # Hello? # Can you read this?
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