python

Posted 2021-03-24 cyd1310997

python
w3cschool
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Python123
中国大学MOOC

正则表达式
Python3 正则表达式_w3cschool

pandas
API reference — pandas 0.25.1 documentation

库函数

os

os.listdir([path])
os.mkdir(path)
os.system(string)

os.path

os.path.exists(path)

pathlib

pathlib.Path(path).is_file()
pathlib.Path(path).is_dir()
pathlib.Path(path).exists()

shutil

shutil.copyfile(src_path, des_path)

re

re.match(pattern, string)
re.search(pattern, string)
re.sub(pattern, s, string)

pandas as pd

read_excel()
read_csv()
to_excel()
to_csv()
Series()
DataFrame()
apply()

random

random.choice(list)
random.shuffle(list)

time

time.ctime()

范例

检测文档的编码格式

import chardet
chardet.detect(open('0.csv', 'rb').read())['encoding']

将文件转成utf-8

def getEncoding(file_name):
    with open(file_name, 'rb') as f:
        return chardet.detect(f.read())['encoding']

def file2utf8(file_name):
    with open(file_name, 'r', encoding = getEncoding(file_name)) as f:
        s = f.read()
    with open(file_name, 'w', encoding = 'utf-8') as f:
        f.write(s)

Excel数据库互转

import pandas as pd
import sqlite3 as sql
# Excel 转 数据库
pd.read_excel('age.xls').to_sql(con = sql.connect('age.db'), name = 'age', index = False)
# 数据库 转 Excel
pd.read_sql('select * from company', con = sql.connect('company.db')).to_excel('company.xls', index = False)