string str2="hello"; string s2="weakhaha"; s.insert(0,s2,1,3);//将字符串s2从下标为1的e开始数3个字符,分别是eak,插入s串的下标为0的字符h前 1. 2. 3. 输出eakhello 应用团体程序设计天梯赛-练习集——L1-032 Left-pad (20分) string(n,‘0’)输出n个0字符 2.e
Adding left padding to a string means adding a given character at the start of a string to make it of the specified length. Left padding, outside of simple formatting and alignment reasons can be really useful when naming files that start with a number generated in a sequence. For example,...
结合这两个方法,我们可以创建一个新的函数,完成字符串两边的补齐。 defpad_string(s,total_length,fillchar=' '):iflen(s)>=total_length:returnselse:total_padding=total_length-len(s)left_padding=total_padding//2right_padding=total_padding-left_paddingreturnfillchar*left_padding+s+fillchar*right_pad...
upper() -> string Return a copy of the string S converted to uppercase. """ return "" def zfill(self, width): """方法返回指定长度的字符串,原字符串右对齐,前面填充0。""" """ S.zfill(width) -> string Pad a numeric string S with zeros on the left, to fill a field of the ...
python的string模块 1.字符串属性方法操作: 1.>字符串格式输出对齐 1 2 3 4 5 6 7 8 9 10 11 >>>str="Python stRING" >>>printstr.center(20)#生成20个字符长度,str排中间 Python stRING >>>printstr.ljust(20)#生成20个字符长度,str左对齐 ...
a nice string representation of the object. | If the argument is a string, the return value is the same object. | | Method resolution order: | str | basestring | object | | Methods defined here: | | __add__(...) | x.__add__(y) <==> x+y | | __contains__(...) | x...
用string.format:>>> msg = 'hello world'>>> 'msg: {}'.format(msg)'msg: hello world'有了f-string后,可以简化成如下:>>> msg = 'hello world'>>> f'msg: {msg}''msg: hello world’可以看到,用fstring明显就清晰简化了很多,并且也更加具有可读性。fstring的一般用法如下:可以f或者F开头,...
可以直接提供需要转换的列名以默认的日期形式转换,也可以用字典的格式提供列名和转换的日期格式,比如{column_name: format string}(format string:"%Y:%m:%H:%M:%S") columns 要选取的列。一般没啥用,因为在sql命令里面一般就指定要选择的列了 chunksize 如果提供了一个整数值,那么就会返回一generator,每次输出的...
encoding=string 通过encoding参数指定编码格式,对一些汉字或者其他编码的文本读取而言,很重要 1.3 excel文件读取 ecxel文件是目前用到最多的文件,但是其编码格式在linux系统上为二进制,直接打开时会存在文本乱码的情况。pandas模块提供了直接读取excel文件读取的方法,不过需要xlrd和openpyxl两个模块用来读写文件,在使用pandas...
""" pass def zfill(self, *args, **kwargs): # real signature unknown """ Pad a numeric string with zeros on the left, to fill a field of the given width. The string is never truncated. """ pass def __add__(self, *args, **kwargs): # real signature unknown """ Return self...