[PYTHON] [Complete memorandum] A collection of codes that I often use but cannot remember

Introduction

I write it a lot, but for some reason I can't remember it, so I've put together the code that I google every time.

Python

That's magic

if __name__ == '__main__':
    print('Hello World!')

Hide warnings

import warnings
warnings.filterwarnings('ignore')

Save the list to a txt file

#Save
with open('list.txt', 'w') as f:
    print(*list_obj, sep='\n', file=f)

#Read
with open('list.txt') as f:
    list_obj = f.read().splitlines()
# list_obj = list(map(lambda x: x.split(','), list_obj)) #For two or more dimensions

Search in list

list = [i for i in list if 'hogehoge' in i]

Progress bar display

from tqdm import tqdm

# jupyter notebook
from tqdm import tqdm_notebook as tqdm

Show all pandas columns

import pandas as pd
pd.set_option('display.max_rows', None)

Setting the character limit in pandas

import pandas as pd
pd.set_option('display.max_colwidth', 1000)

Change the size of the figure

fig = plt.figure(figsize=(20, 10))

Bar Plot

plt.bar(df.index, df['value'], align='center')
plt.xticks(df.index, df.index)

Extract the character string before a certain character string (delete the character after a certain character string)

t = 'abc/def'
print(t.split('/')[0]) # abc
print(t.split('/')[1]) # def

#If there is no specified character when mapping to the matrix, an error will be thrown, so it is better to map with the following function.
def pick_char(t):
    try:
        return t.split('/')[0]
    except IndexError:
        return t
df.map(pick_char)

Remove extra strings

t = '\n\t\r\u3000        abc        \u3000\r\t\n'
print(t.strip()) # abc

Delete pip cache and install

$ pip install --no-cache-dir <Library>

Reinstall with -I

git

Delete cache

$ git rm -r --cached .

Command line

Granting authority

$ chown -R $USER <dir>

in conclusion

I will add it as soon as I encounter a convenient character string operation.