Python学习笔记026

文件属性

f=open('poem8','w',encoding='utf8')

# 用非负整型数来表示当前操作对象的文件号
print(f.fileno())

# 判断操作对象是否为终端，返回 True / False
print(f.isatty())

# 判断操作对象是否可读，返回 True / False
print(f.readable())

# 判断操作对象是否可写，返回 True / False
print(f.writable())


修改文件
f=open('poem8','r',encoding='utf8')
n=[]

number=0
for line in f:
    number+=1
    if number==13:
        n.append(line.strip()+' I like it')
    else:
        n.append(line.strip())

f.close()

m=open('poem8','w',encoding='utf8')
for line in n:
    m.write(line+'\n')
m.close()

# 修改文件
f_read=open('poem8','r',encoding='utf8')
f_write=open('poem9','w',encoding='utf8')

number=0
for line in f_read:
    number+=1
    if number==13:
        f_write.write(line.strip()+' I like it\n')
    else:
        f_write.write(line)

f_read.close()
f_write.close()

# 修改文件
f_read=open('poem8','r',encoding='utf8')
f_write=open('poem9','w',encoding='utf8')

number=0
for line in f_read:
    number+=1
    if number==13:
        line=''.join([line.strip(),' I like it\n'])
    f_write.write(line)

f_read.close()
f_write.close()