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...
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...
>>>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...
""" 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...
read_data = file.read() except FileNotFoundError as fnf_error: print(fnf_error) finally: print('这句话,无论异常是否发生都会执行。') 抛出异常 Python 使用 raise 语句抛出一个指定的异常。 raise语法格式如下: raise [Exception [, args [, traceback]]] ...
infile = open('test02.txt', 'r', encoding="utf8").read() for line in infile: print(line) print(infile.close()) 输出结果《静夜思》如下图所示,包含TXT文件和输出值。 二.CSV文件操作 我们在使用Python进行网络爬虫或数据分析时,通常会遇到CSV文件,类似于Excel表格。接着我们补充SCV文件读写的基础知...