python之檔案讀寫和異常處理

# 檔案讀取、寫入和異常處理操作舉例

# date:2017-07-17
file_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!")

執行結果：

hello

world
!------------------------
hello
world
!------------------------
hello
world
!------------------------
file 'd:/file_demo_none.txt' not found!

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