try: fp=open(r"C:\temp\files\abc.txt", "r") txt1=fp.read() print(txt1) fp.close()except FileNotFoundError: print("请检查路径！")「读取文件中的n个字符」使用read(n)，从光标位置开始读取，跨行读取时，换行符计算在内。try: fp=open(r"C:\temp\files\abc.txt", "...
f = open("E:/test.txt", 'r', encoding = "UTF-8") # 读取文件-read #print(f"读取十个字节:{f.read(10)}") #print(f"读取全部内容:{f.read()}") # 读取文件-readlines #lines = f.readlines() #print(f"读取全部内容:{lines}") # 读取文件-readline """ line1 = f.readline() lin...
""" readinto() -> Undocumented. Don't use this; it may go away. """ pass def readline(self, size=None): # real signature unknown; restored from __doc__ 仅读取一行数据 """readline([size]) -> next line from the file, as a string. Retain newline. A non-negative size argument ...
f.seek(0)#因为W+读取文件之后会定位在文件尾部,所以需要重新定位一下光标位置,要不无法读取print("定位之后的光标位置:%s"%(f.tell()))i=f.read()print(i)f.close()#关闭文件夹输出:C:\Python35\python.exeD:/linux/python/all_test/listandtup.py定位之前的光标位置:17定位之后的光标位置:0我要学Pyt...
>>>f2=open('/tmp/test.txt','r+')>>>f2.read()'hello girl!'>>>f2.write('\nhello boy!')>>>f2.close()[root@node1 python]# cat/tmp/test.txt hello girl!hello boy! 可以看到,如果在写之前先读取一下文件,再进行写入,则写入的数据会添加到文件末尾而不会替换掉原先的文件。这是因为指针引...
tmp_arr)import csv def read_file1():with open('tmp_arr1.csv','r',encoding='UTF-8-SIG') as fp:# reader相当于一个迭代器 reader = csv.reader(fp)# 使用next，那么就相当于把指针fp向下移动一行 next(reader)next(reader)next(reader)next(reader)for read in reader:print(read)read_file1(
read([value]):value为设置内容读取的长度 举个例子(与指针结合起来看) #首先我先创建一个a.txt文件,内容为12345678with open("a.txt","r") as file: content= file.read(3) //读取长度为3 next_content= file.read() //第二次读取print(content) // 123print(next_content) // 45678#为什么第二次...
""" readinto() -> Undocumented. Don't use this; it may go away. """ pass def readline(self, size=None): # real signature unknown; restored from __doc__ 仅读取一行数据 """ readline([size]) -> next line from the file, as a string. Retain newline. A non-negative size argument...
print "文件名为: ", fo.name line = fo.read(10) print "读取的字符串: %s" % (line) # 关闭文件 fo.close()以上实例输出结果为:文件名为: runoob.txt 读取的字符串: 1:www.runoPython File(文件) 方法Python File next() 方法 Python File readline() 方法 点...
read()可以从文件中读入全部文本。 readlines()可以从文件中读入所有行,以每行为元素形成一个列表。 seek()改变当前文件操作指针的位置。 write()方法是向文件写入一个字符串或者字节流。(write() argument must be str, not list) writelines() 方法用于向文件中写入一序列的字符串。必须元素是字符串 ...