技術標籤：python

#讀文字檔案   read(n)讀n個字元  read()讀整個文字    n>實際個數，讀取實際個數    如果已經讀到檔案尾部了，再度返回空串
#遇到\n  \r    \r\n作為換行標識，並統一轉換為\n作為文字輸入換行符
def writeFile():
    fobj=open("./student.txt","wt")
    fobj.write("abc\nxyz")
    fobj.close()
def readFile():
    fobj=open("./student.txt"
 
,"rt")
    s=fobj.read()
    print(s)
    fobj.close()
try:
    writeFile()
    readFile()
except Exception as err:
    print(err)


def writeFile():
    fobj=open("./student.txt","wt")
    fobj.write("abc\nxyz")
    fobj.close()
def readFile(n):
    fobj=open(
 
"./student.txt","rt")
    s=fobj.read(n)
    print(s)
    print(len(s))
    fobj.close()
try:
    writeFile()
    n=520
    readFile(n)
except Exception as err:
    print(err)


#如果檔案指標已經到了檔案的尾部，再讀就返回一個空串
def writeFile():
    fobj=open("./student.txt","wt")
    fobj.
 
write("ab c\nxyz")
    fobj.close()
def readFile():
    fobj=open("./student.txt","rt")
    flag=1
    st=""
    while flag==1:
        s=fobj.read(1)
        if s!="":
            st=st+s
        else:
            flag=0
    fobj.close()
    print(st)
try:
    writeFile()
    readFile()
except Exception as err:
    print(err)


#讀取一行的函式readline
#readline()一直讀到'\n'或檔案尾為止
#如果讀到'\n',那麼返回的字元包含'\n'
#如果到了檔案尾部，再次就讀到一個空字串
def writeFile():
    fobj=open("./student.txt","wt")
    fobj.write("abc\nxyz")
    fobj.close()
def readFile():
    fobj=open("./student.txt","rt")
    s=fobj.readline()
    print(s,"length=",len(s))
    s=fobj.readline()
    print(s,"length=",len(s))
    s=fobj.readline()
    print(s,"length=",len(s))
    fobj.close()
try:
    writeFile()
    readFile()
except Exception as err:
    print(err)
    

#一行一行讀取檔案資料
def writeFile():
    fobj=open("./abc.txt","wt")
    fobj.write("abc\nxyz")
    fobj.close()

def readFile():
    fobj=open("./abc.txt","rt")
    goon=1
    st=""
    while goon==1:
        s=fobj.readline()
        if s!="":
            st=st+s
        else:
            goon=0
    fobj.close()
    print(st)

try:
    writeFile()
    readFile()
except Exception as err:
    print(err)

#讀取所有行的函式readlines一般和for配合使用
def writeFile():
    fobj=open("./abc.txt","wt")
    fobj.write("abc\neee\nxyz")
    fobj.close()

def readFile():
    fobj=open("./abc.txt","rt")
   # print(fobj.readlines())#['abc\n', 'eee\n', 'xyz']
    for x in fobj.readlines():
        print(x,end='')
    fobj.close()

try:
    writeFile()
    readFile()
except Exception as err:
    print(err)


#讀取儲存在student.txt檔案學生資訊
class student:
    def __init__(self,name,gender,age):#建構函式
        self.name=name
        self.gender=gender
        self.age=age
    def show(self):#類函式
        print(self.name,self.gender,self.age)

students=[]
try:
    f=open("student.txt","rt")
    while True:
        name=f.readline().strip("\n")#將一行的前後/n字元去掉
        if name=="":
            break
        gender=f.readline().strip("\n")
        age=float(f.readline().strip("\n"))
        students.append(student(name,gender,age))#類放入students
    f.close()

    for s in students:
        s.show()
except Exception as err:
    print(err)