1.1 打开文件---file.open() 使用open()函数打开文件,语法为: importfile f=open(file_name="xx.txt", mode='r', buffering=-1, encoding=None, errors=None, newline=None, closefd=True, opener=None) 其中,file_name为文件名,mode为打开文件的模式,buffering为缓冲区大小,encoding为编码格式,errors为错...
1011"""1213f = open("passwd")#file对象,默认以只读方式打开文件,该文件必须存在,否则会抛出"FileNotFoundError"异常14print(f.read())#d读取文件15f.close()#关闭文件16171819#"passwd"文件内容如下:20root:x:0:0:root:/root:/bin/bash21bin:x:1:1:bin:/bin:/sbin/nologin22daemon:x:2:2:daemon:...
File "<stdin>", line 1, in <module> IOError: File not open for writing 1. 2. 3. 4. 应该先指定可写的模式 >>> f1 = open('/tmp/test.txt','w') >>> f1.write('hello boy!') 1. 2. 但此时数据只写到了缓存中,并未保存到文件,而且原先里面的配置被清空了。 关闭这个文件即可将缓存...
>>> # Read and print the entire file line by line >>> line = reader.readline() >>> while line != '': # The EOF char is an empty string >>> print(line, end='') >>> line = reader.readline() Pug Jack Russel Terrier English Springer Spaniel German Shepherd Staffordshire Bull Ter...
count=0 #文件内容写入就要改变open函数打开模式,"at+"是追加写模式,同时可以读写 with open("poems.txt",'at+',encoding='UTF-8') as file: count+=file.write("瀚海阑干百丈冰,愁云惨淡万里凝。\n") print("向文件写入的字符数:",count) #output: 向文件写入的字符数: 17 #包含换行符共17个 [Fin...
jieba.enable_parallel(8)input_file=open(input_file_name,'r',encoding='utf-8')output_file=open(output_file_name,'w')forlineininput_file:temp=line.split('\t')iflen(temp)!=4:continuename=getFirstName(temp[1])ifname!=False:#print(name)姓名作为一行中的一个字段,其他为你需要的字段 ...
data = xlrd.open_workbook(filename)#文件名以及路径,如果路径或者文件名有中文给前面加一个 r 常用的函数 excel中最重要的方法就是book和sheet的操作 (1)获取book(excel文件)中一个工作表 table = data.sheets()[0]#通过索引顺序获取table = data.sheet_by_index(sheet_indx)#通过索引顺序获取table = data...
"""readline([size]) -> next line from the file, as a string. Retain newline. A non-negative size argument limits the maximum number of bytes to return (an incomplete line may be returned then). Return an empty string at EOF. """ ...
Filenameis'zen_of_python.txt'.Fileisclosed. 1. 2. 但是此时是不可能从文件中读取内容或写入文件的,关闭文件时,任何访问其内容的尝试都会导致以下错误: 复制 f.read() 1. Output: 复制 ---ValueErrorTraceback(mostrecentcalllast)~\AppData\Local\Temp/ipykernel_9828/3059900045.pyin<module>--->1f....
filename) return self.file def __exit__(self, exc_type, exception, traceback): self.file.close() >>> with open('test.txt', 'w') as file: ... file.write('Hello World!') >>> with MyOpen('test.txt') as file: ... print(file.read()) Hello World! Iterable Duck Types ...