""" 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.read()# 一次读取文件内容,成一个字符串。'#\ninterface GigabitEthernet0/0/1\n#\ninterface NULL0\n#\nstelnet server enable\n#\nuser-interface con 0\nauthentication-mode password\nuser-interface vty 0 4\nauthentication-mode aaa\nuser-interface vty 16 20\n#\n'>>>f.read()# 再读...
# 配置服务器,并发送邮件 server=smtplib.SMTP(smtp_server,25)server.set_debuglevel(1)server.login(from_addr,password)server.sendmail(from_addr,[to_addr],msg.as_string())# msg调用了自己的as_string()函数,将整个Email内容结构转换成字符串再发送.# as_string函数运行后,得到的就是一封Base64编码的Em...
read(size=-1) #从文件中读取整个文件内容,如果给出参数,读入前size长度的字符串(文本文件)或字节流(二进制文件),size=-1默认读取全部。 栗子1. #test2_1.py文件 with open("English_Study_Dict.txt",'rt') as file: a=file.readable() #判断文件是否可读取 b=file.writable() #判断文件是否可写入...
pic=stream_pic.read()print(pic) 读取整个文件 要读取文件,需要一个包含几行文本的文件。下面首先来创建一个文件,它包含精确到小数点后30位的圆周率值,且在小数点后每10位处都换行: with open('d:/pi_digits.txt') as file_object:#返回一个表示文件的对象contents = file_object.read()#读取文件对象的...
After a file is opened, read and write operations can be performed on the file according to the opening mode. Note that when the file is opened as a text file, read and write in string mode, using the encoding used by the current computer or the specified encoding; When the file is ...
with open('example.txt', 'r', encoding='utf-8') as f: print(f.tell()) # 输出:0(初始位置) f.read(5) # 读取前 5 个字符 print(f.tell()) # 输出:5(当前位置) f.seek(0) # 回到文件开头 print(f.read(1)) # 输出:第一个字符 ...
②语义上的用途不同,read_cav()名字说明它是为CSV文件设计的,read_table()更通用,适用于“任意分隔符的表格data”,尤其是.txt格式】 ③从上述example可知,标识各列名称的表头位于CSV文件的第一行,但是一般情况并非如此,往往CSV文件的第一行列表data。如下所示: 1,5,2,3,cat 2,7,8,5,dog 3,3,6,7...
json.load(file_object) 示例:假设JSON如下所示。 我们想读取该文件的内容。下面是实现。 代码语言:javascript 代码运行次数:0 运行 AI代码解释 # Python program to read # json fileimportjson # OpeningJSONfile f=open('data.json',)# returnsJSONobjectas# a dictionary ...
This code first attempts to read user input and convert it to an integer. If the input is valid, the code in the else block executes; otherwise, the code in the except block executes. Regardless of the outcome, the code in the finally block will always execute. 六、总结（Summary） ...