13 文件操作

f = open(‘模特主妇护士班主任.txt‘,mode = ‘r‘,encoding=‘utf-8‘)
content = f.read()
print(content)
f.close()

f = open(‘g:\MyPython\模特主妇护士班主任.txt‘,mode = ‘r‘,encoding=‘utf-8‘)
content = f.read()
print(content,type(content))  #我们是中国人民解放军 <class ‘str‘>
f.close()

f = open(‘g:\MyPython\模特主妇护士班主任.txt‘,mode = ‘rb‘)
content = f.read()
print(content) #b‘\xe6\x88\x91\xe4\xbb\xac\xe6\x98\xaf\xe4\xb8\xad\xe5\x9b\xbd\xe4\xba\xba\xe6\xb0\x91\xe8\xa7\xa3\xe6\x94\xbe\xe5\x86\x9b‘
f.close()

f = open(‘log‘,mode = ‘w‘,encoding=‘utf-8‘)
f.write(‘我们是12骑兵‘)
f.close()

f = open(‘log1‘,mode = ‘wb‘)
f.write(‘我们是12骑兵‘.encode(‘utf-8‘))
f.close()

f = open(‘log1‘,mode = ‘wb‘)
f.write(‘我们是12骑兵‘.encode(‘gbk‘))
f.close()

f = open(‘log‘,mode = ‘a‘,encoding=‘utf-8‘)
f.write(‘在后面加‘)
f.close()

f = open(‘log‘,mode = ‘ab‘)
f.write(‘新地‘.encode(‘utf-8‘))
f.close()

f = open(‘log‘,mode = ‘r+‘,encoding=‘utf-8‘)
print(f.read())              #我们是中国人民解放军
f.write(‘中主的耻地是地‘)   #我们是12骑兵在后面加新地中主的耻地是地
f.close()

f = open(‘log‘,mode = ‘r+‘,encoding=‘utf-8‘)  #不要先写后读
f.write(‘asddes‘)
print(f.read())
f.close()

f = open(‘log‘,mode = ‘r+b‘)  #以bytes读写
print(f.read())
f.write(‘中主的耻地是地‘.encode(‘utf-8‘))
f.close()

f = open(‘log2‘,mode = ‘w+‘,encoding=‘utf-8‘)
f.write(‘我们是12骑兵‘)
f.seek(0)           #指向位置的光标
print(f.read())     #我们是12骑兵
f.close()

f = open(‘log‘,mode = ‘a+‘,encoding=‘utf-8‘)
f.write(‘在后面加‘)
f.seek(0)           #指向位置的光标
print(f.read())
f.close()

f = open(‘模特主妇护士班主任.txt‘,mode = ‘r+‘,encoding=‘utf-8‘)  #asdfkvngifftr
content = f.read(3)     #读取个数 read是按字符指定
print(content)          #asd
f.seek(3)               #指针指向 3
print(f.tell())         #当前光标位置 3
print(f.read())         #fkvngifftr
f.close()

f = open(‘log‘,mode = ‘a+‘,encoding=‘utf-8‘)  #asddes是12
f.write(‘在后面加‘)                             #asddes是12在后面加
count = f.tell()        #当前光标位置
f.seek(count-6)         #指向位置的光标
print(f.read(1))        #读一个字          面
f.close()

f = open(‘log‘,mode = ‘a+‘,encoding=‘utf-8‘)    #asddes是12
                                                  #早顺呃顷欠
f.seek(0)
line = f.readline()         #读一行               #asddes是12
print(line)
f.seek(f.tell())            #文件光标指向前一个结束光标
line = f.readline()         #读一行               #asddes是12
print(line)
f.seek(0)
line = f.readlines()        #每一行当成列表中的一个元素
print(line)                 #[‘asddes是12\n‘, ‘早顺呃顷欠‘]
f.seek(0)
for line in f:             #循环打印文件中的内容  （如果文件大不可以这样读）
    print(line)             #asddes是12
                            #早顺呃顷欠
f.close()

with open(‘log‘,mode = ‘r+‘,encoding=‘utf-8‘) as obj:  #with  不用关闭语句
    print(obj.read())

with open(‘log‘,mode = ‘r+‘,encoding=‘utf-8‘) as f,        open(‘log‘,mode = ‘w+‘,encoding=‘utf-8‘) as f1:
    print(f.read())