python常用代码片段

Python3常用

目录

• Python3常用
  • 文件处理
  • json处理
  • log日志
  • argparse使用
  • INIparser
  • 文件或目录的相关操作

文件处理

class BaseMethod:

    @staticmethod
    def run_cmd(cmd):
        print_log("RUN CMD: %s" %cmd)
        retcode, output = subprocess.getstatusoutput(cmd)
        return retcode, output

    @staticmethod
    def write_file(filename, content):
        with tempfile.NamedTemporaryFile('w', dir=os.path.dirname(filename), delete=False) as tf:
            tf.write(content)
            tf.flush()
            tmpname = tf.name
        os.rename(tmpname, filename)

    @staticmethod
    def read_file_with_json(file_name, mode="r"):
        if not os.path.exists(file_name):
            raise IOError("No such file or directory: %s" % file_name)
        with open(file_name, mode) as fp:
            json_body = json.load(fp)
        return json_body

    @staticmethod
    def write_json_to_file(file_name, json_body, mode="w+"):
        # json_body 要求是字典
        with tempfile.NamedTemporaryFile(mode, dir=os.path.dirname(file_name), delete=False) as fp:
            json_str = json.dumps(json_body, indent=4, sort_keys=True)
            fp.write(json_str)
            fp.flush()
            temp_name = fp.name
        os.rename(temp_name, file_name)

    @staticmethod
    def json_file_format(source_filename, dest_filename):
        json_body = BaseMethod.read_file_with_json(source_filename)
        BaseMethod.write_json_to_file(dest_filename, json_body)

json处理

class FileBaseClass():
    @staticmethod
    def read_file_with_json(file_name, mode="r"):
        if not os.path.exists(file_name):
            raise IOError("No such file or directory: %s" % file_name)
        with open(file_name, mode) as fp:
            json_body = json.load(fp)
        return json_body

    @staticmethod
    def write_json_to_file(file_name, json_body, mode="w+"):
        with tempfile.NamedTemporaryFile(mode, dir=os.path.dirname(file_name), delete=False) as fp:
            json_str = json.dumps(json_body, indent=4, sort_keys=True)
            fp.write(json_str)
            fp.flush()
            temp_name = fp.name
        os.rename(temp_name, file_name)

    @staticmethod
    def json_file_format(source_filename, dest_filename):
        json_body = FileBaseClass.read_file_with_json(source_filename)
        FileBaseClass.write_json_to_file(dest_filename, json_body)

log日志

import argparse
import os
import shutil
import json
import logging
import subprocess
import tempfile
import traceback
from spec_template import spec_template

log = logging.getLogger(__name__)
log.setLevel(level=logging.INFO)
handler = logging.FileHandler("rpm_build.log")
handler.setLevel(logging.INFO)
formatter = logging.Formatter('%(asctime)s - %(name)s - %(levelname)s - %(message)s')
handler.setFormatter(formatter)
log.addHandler(handler)

log.info("enter rpmbuild_core ...")

argparse使用

def main():
    usg = """
        python3 rpmbuild_core.py -r $ROOT_DIR -n BSWM -c arm32A15le_4.4_ek_preempt -f relative_file_path

    """

    parser = argparse.ArgumentParser(prog=__file__, formatter_class=argparse.RawDescriptionHelpFormatter,
                                     description=usg)

    parser.add_argument('-r', '--rootdir', nargs=1, help='必选，root工作目录ROOT_DIR')  # 返回的是list
    parser.add_argument('-n', '--compname', nargs='+', default='BSWM', help='可选，指定组件名称')
    parser.add_argument('-c', '--cputype', nargs='+', default='x86_64', help='可选，指定cpu类型')
    parser.add_argument('-f', '--file_path', nargs='?', default='', help='可选，指定额外的json文件，需要个人维护。value值为当前ROOT_DIR的相对目录')

    args = parser.parse_args()
    try:
        root_dir = args.rootdir[0]
        comp_name = args.compname[0]
        cpu_type = args.cputype[0]
        extra_file_path = args.file_path
        print('root_dir: %s, comp_name: %s, cpu_type: %s' % (root_dir, comp_name, cpu_type))
        main_func(root_dir, comp_name, cpu_type, extra_file_path)

    except Exception:
        traceback.print_exc()
        print('Please use -h/--help to get usage!')
        exit(1)
    log.info("leave rpmbuild_core success.")

if __name__ == '__main__':
    main()

INIparser

这个还很不完善，仅供参考。

class INIparser(object):

    def __init__(self, input_file):

        self.input = input_file
        self.output = self.input

    def get_target_key(self, sect, key):
        conf = configparser.ConfigParser()
        conf.read(self.input, encoding='utf-8')
        if sect in conf.sections():
            return conf[sect].get(key)
        return ""

    def add_section(self, sect):
        conf = configparser.ConfigParser()
        conf.read(self.input, encoding='utf-8')
        if sect in conf.sections():
            return
        else:
            conf.add_section(sect)
            with open(self.output, 'w', encoding='utf-8') as fp:
                conf.write(fp)

    def add_target_key(self, sect, k_with_v):
        temp_list = k_with_v.split('=')
        key, value = temp_list[0], temp_list[1]
        conf = configparser.ConfigParser()
        conf.read(self.input)
        if sect not in conf.sections():
            conf.add_section(sect)
        conf.set(sect, key, value)
        with open(self.output, 'w') as fp:
            conf.write(fp)

    def rm_target_key(self, sect, key):
        conf = configparser.ConfigParser()
        conf.read(self.input, encoding='utf-8')
        if sect in conf.sections():
            conf.remove_option(sect, key)
            with open(self.output, 'w', encoding='utf-8') as fp:
                conf.write(fp)

    def rm_target_section(self, sect):
        conf = configparser.ConfigParser()
        conf.read(self.input, encoding='utf-8')
        t = conf.remove_section(sect)
        print(t)
        with open(self.output, 'w', encoding='utf-8') as fp:
            conf.write(fp)

文件或目录的相关操作