Jure Šorn
7 years ago
3 changed files with 423 additions and 188 deletions
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218CONDENSED.md
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58LIBRARIES.md
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335README.md
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Python and Libraries Cheatsheet |
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=============================== |
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Main |
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---- |
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``` |
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if __name__ == '__main__': |
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main() |
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``` |
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Range |
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----- |
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```python |
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range(<from inclusive>, <to exclusive>, <step size>) # Negative step for backward. |
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``` |
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List |
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---- |
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```python |
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<list>[<inclusive from>:<exclusive to>:<step size>] |
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``` |
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Dictionary |
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---------- |
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``` |
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<dict>.items() |
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<dict>.get(<key>, <default>) |
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<dict>.setdefault(<key>, <default>) |
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``` |
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Enumerate |
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--------- |
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``` |
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for i, <el> in enumerate(<list/dict/set>) |
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``` |
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Inline |
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------ |
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### For |
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```pythonstub |
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[i+j for i in range(10) for j in range(10) if i+j > 5] |
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``` |
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### Lambda |
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``` |
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lambda <arg1>, <arg2>: <return value> |
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``` |
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String |
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------ |
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### Print |
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``` |
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print(<el1>, <el2>, end='', sep='', file=<file>) |
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``` |
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### Regex |
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``` |
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import re |
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re.sub(<regex>, <new>, <text>) |
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re.search(<regex>, <text>) |
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``` |
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### Format |
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``` |
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{:<min width>} -> '<el> ' |
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{:><min width>} -> ' <el>' |
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{:^<min width>} -> ' <el> ' |
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{:_<min width>} -> '<el>____' |
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{:.<max width>} -> '<e>' |
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{:<max widht>.<min width>} -> ' <e>' |
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{:<max width>.<no of decimals>f} -> ' 3.14' |
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``` |
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Infinity |
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-------- |
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``` |
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float("inf") |
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``` |
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Class |
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----- |
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### Class |
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``` |
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class <name>: |
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def __init__(self, <arg>): |
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self.a = <arg> |
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def __repr__(self): |
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return str({'a': self.a}) |
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def __str__(self): |
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return str(self.a) |
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``` |
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### Enum |
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``` |
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import enum |
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class <name>(enum.Enum): |
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<value> = <index> |
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``` |
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### Copy |
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``` |
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import copy |
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copy.copy(<object>) |
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copy.deepcopy(<object>) |
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``` |
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Random |
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------ |
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``` |
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import random |
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random.random() |
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random.randint(<from inclusive>, <to inclusive>) |
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random.shuffle(<list>) |
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``` |
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Datetime |
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-------- |
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``` |
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import datetime |
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now = datetime.datetime.now() |
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now.strftime('%Y%m%d') |
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now.strftime('%Y%m%d%H%M%S') |
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``` |
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System |
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------ |
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### Arguments |
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``` |
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import sys |
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sys.argv |
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``` |
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### Read |
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``` |
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with open(<filename>, encoding='utf-8') as file: |
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return file.readlines() |
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``` |
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### Write |
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``` |
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with open(<filename>, 'w', enconding='utf-8') as file: |
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file.write(<text>) |
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``` |
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### Execute Command |
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``` |
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import os |
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os.popen(<command>).read() |
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``` |
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JSON |
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---- |
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``` |
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import json |
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``` |
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### Read |
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``` |
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with open(<filename>, encoding='utf-8') as file: |
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return json.load(file) |
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``` |
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### Write |
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``` |
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with open(<filename>, 'w', enconding='utf-8') as file: |
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file.write(json.dumps(<object>)) |
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``` |
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SQLite |
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------ |
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``` |
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import sqlite3 |
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db = sqlite3.connect(<filename>) |
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``` |
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### Read |
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``` |
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cursor = db.execute(<query>) |
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if cursor: |
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cursor.<fetchone/fetchall>() |
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db.close() |
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``` |
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### Write |
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``` |
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db.execute(<query>) |
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db.commit() |
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``` |
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@ -0,0 +1,58 @@ |
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Libraries |
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========= |
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Plot |
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---- |
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``` |
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import matplotlib |
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matplotlib.pyplot.plot(<data>, ...) |
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matplotlib.pyplot.show() |
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matplotlib.pyplot.savefig(<filename>) |
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``` |
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Web |
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--- |
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``` |
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import bottle |
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``` |
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### Run |
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``` |
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bottle.run(host='localhost', port=8080) |
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bottle.run(host='0.0.0.0', port=80, server='cherypy') |
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``` |
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### Static request |
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### Dynamic request |
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### REST request |
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Curses |
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------ |
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``` |
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import curses |
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def main(): |
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curses.wrapper(draw) |
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def draw(screen): |
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screen.clear() |
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screen.addstr(0, 0, "Press ESC to quit.") |
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while screen.getch() != 27: |
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pass |
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``` |
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Profile |
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------- |
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``` |
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import pycallgraph |
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graph = pycallgraph.output.GraphvizOutput() |
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graph.output_file = <filename> |
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whith pycallgraph.PyCallGraph(output=graph): |
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<code> |
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``` |
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