Python实现文件读写，并添加异常处理

Posted 2020-12-21 杨艳春

 

 没使用函数

#写古诗到文件中
f = open("gushi.txt","w",encoding="utf-8")  #不加encoding="utf-8"文件会出现乱码
f.write(\'\'\'
        静夜思
            李白
窗前明月光，疑是地上霜。
举头望明月，低头思故乡。
        \'\'\')
f.close()

#复制：先读出文件中内容，再写入新的文件
f = open("gushi.txt","r",encoding="utf-8")
m = open("copy.txt","w",encoding="utf-8")

content = f.readlines()
# m.write(content)     不能这样写，write()里面只能写字符串，不能写列表
for i in content:
    m.write(i)

f.close()
m.close()

 

使用函数

 def writeFile(filename,content):
f = open(filename,"w",encoding="utf-8")
for i in content:
f.write(i)
f.close()

def readFile(filename):
f = open(filename,"r",encoding="utf-8")
contents = f.readlines()
return contents
f.close()

gushi = ["日照香炉生紫烟\\n","遥看瀑布挂前川\\n","飞流直下三千尺\\n","疑似银河落九天\\n"]
writeFile("gushi.txt",gushi)
contents = readFile("gushi.txt")
copy = []
for content in contents:
copy.append(content)
writeFile("copy.txt",copy)

 加上异常捕获

try:

    def writeFile(filename,content):
        f = open(filename,"w",encoding="utf-8")
        for i in content:
            f.write(i)
        f.close()

    def readFile(filename):
        f = open(filename,"r",encoding="utf-8")
        contents = f.readlines()
        return contents
        f.close()

    gushi = ["日照香炉生紫烟\\n","遥看瀑布挂前川\\n","飞流直下三千尺\\n","疑似银河落九天\\n"]
    writeFile("gushi.txt",gushi)
    contents = readFile("gushi.txt")
    copy = []
    for content in contents:
        copy.append(content)
    writeFile("copy.txt",copy)
    print("复制完毕")

except Exception as result:
    print("产生错误了")
    print(result)