python之檔案讀寫和異常處理__python

# 檔案讀取、寫入和異常處理操作舉例# date:2017-07-17file_name = "D:/file_demo.txt"with open(file_name, 'w') as write_file_obj:    '''寫入檔案'''    write_file_obj.write("hello\n")    write_file_obj.write("world\n")with open(file_name, 'a') as write_file_obj:    '''追加檔案'''    write_file_obj.write(" ! ")with open(file_name) as file_obj:    '''讀取檔案全部內容'''    whole_context = file_obj.read()    print(whole_context.strip())    print('------------------------')with open(file_name) as file_obj:    '''逐行讀取檔案內容'''    for line in file_obj:        print(line.strip())  # 去除左右空格    print('------------------------')with open(file_name) as file_obj:    '''列表形式讀取檔案內容'''    lines = file_obj.readlines();    for line in lines:        print(line.strip())  # 去除左右空格    print('------------------------')file_name = "D:/file_demo_none.txt"try:    '''異常處理：檔案不存在'''    with open(file_name) as file_obj:        whole_context = file_obj.read()        print(whole_context.strip())except FileNotFoundError:    print("File '" + file_name + "' not found!")else:    print("File '" + file_name + "' exists!")

　　

 運行結果：

helloworld !------------------------helloworld!------------------------helloworld!------------------------File 'D:/file_demo_none.txt' not found!