bytes和str都是序列,bytes当中存储的是8位值,str当中存储的内容是Unicode码点; 为了敲代码方便,可以自己写一些帮助函数来做bytes与str之间的转换; bytes和str是两种数据类型,不可以直接比较; 如果想从文件中读写二进制文件,请在打开文件时指定二进制模式; 如果想从文件中读写Unicode内容,需要注意系统的默认编码
奇怪的是,unicode也有decode,而str也有 encode,到底这两个是干什么的。 用处1 str本身已经是编码过的了,如果再encode很难想到有什么用(通常会出错的) 先解释下这个 str.encode(e) is the same as unicode(str).encode(e). This is useful since code that expects Unicode strings should also work when it...
str = 'xxx' print( str ) 使用双引号 " 在双引号中的字符串与单引号中的字符串的使用完全相同,例如"xxx"。 代码语言:python 代码运行次数:0 运行 AI代码解释 str = "What's your name?" print( str ) 使用三引号(‘’'或"“”) 利用三引号,你可以指示一个多行的字符串。你可以在三引号中自由的...
>>>print'my name is {mingzi},I like{shuiguo}'.format(shuiguo=fruit,mingzi=name) my nameisStivenWang,I like apple 9.检测字符串string中是否包含子字符串str,如果存在,则返回str在string中的索引值,如果指定beg(开始)和end(结束)范围,则检查是否包含在指定范围内,该方法与python find()方法一样,只不过...
A class can control what this function returns for its instances by defining a__repr__()method. 一个雷可以通过定义__repr__()方法的方式来控制这个具体实例中这个函数的返回。 解释: 1.关于eval()函数。 可以看出如果不使用repr,字符串x+1就会在eval函数中被当成表达式计算为2,而使用repr函数就不会被...
str3 = "Hello, world!" # compare str1 and str2 print(str1 == str2) # compare str1 and str3 print(str1 == str3) Run Code Output False True In the above example, str1 and str2 are not equal. Hence, the result is False. str1 and str3 are equal. Hence, the result is ...
The resp.status will have our return code in it, and the resp.reason will explain why the return code was what it was. This will allow us to know the site is down. If we want to watch a site to make sure it stays up during our test, we can use the watch command. To update ...
str = "{} is a beautiful {}!".format("Beijing","city") print(str) 执行以上代码,输出结果为: Beijing is a beautiful city! (2)通过索引的方式匹配参数 str1 = "{0} is a beautiful {1}!".format("Beijing", "city") print(str1) str2 = "{1} is a beautiful {2}!".format("Tianjin...
What's your name? my name is libin 1. 2. 3. 4. 5. 6. 7. 7. python 连接字符串 # 1.直接相加 print("py" + "thon") # "python" a = 1989 b = "free" # print(b + a) 这种会报错 TypeError: unsupported operand type(s) for +: 'int' and 'str' 。
The syntax of regular expressions is a double-edged sword. As a form of a domain-specific language (DSL), it’s very efficient, but at the same time, its brevity often contributes to poor readability. What’s more, the same symbol can take different meanings depending on where in the ...