In addition, we canaccess just a specific characteror aslice of charactersof a string. We might want to do this, for example, if we have a text that’s too long to display and we want to show just a portion of it. Or if we want to make an acronym by taking the first letter of...
So Python returns a new string to me. 我也可以使用负索引进行切片。 I can also do slicing using negative indices. 例如,如果我键入S,减去3,Python将给出该序列中的最后三个字符,即h、o和n。 So for example, if I type S, minus 3, Python will give me the last three characters in that sequ...
Split the string at the last occurrence of sep, and return a 3-tuple containing the part before the separator, the separator itself, and the part after the separator. If the separator is not found, return a 3-tuple containing two empty strings, followed by the string itself. >>>a ='ab...
bvalue = longstring.encode("ascii")else: bvalue = longstringimportdmPython conn = dmPython.connect(user='SYSDBA', password='***', server='localhost', port=51236) cursor = conn.cursor()try:#清理测试环境cursor.execute("select object_id from all_objects where object_type='TABLE' and OBJEC...
'stRINg lEArn ' >>> >>> str.rjust(20) #str右对齐 ' stRINg lEArn' >>> >>> str.zfill(20) #str右对齐,左边填充0 '00000000stRINg lEArn' 大小写转换 >>> str='stRINg lEArn' >>> >>> str.upper() #转大写 'STRING LEARN' >>> ...
word[-1]#Thelastcharacter A word[-2]#Thelast-but-onecharacter p word[-2:]#Thelasttwocharacters pA word[:-2]#Allbutthelasttwocharacters Hel 不过-0还是0,所以它不是从右边计数的! word[-0]#(since-0equals0) H 越界的负切片索引会被截断,不过不要尝试在前元素索引(非切片的)中这样做: word...
string 对象的 split() 方法只适应于非常简单的字符串分割情形,它并不允许有多个分隔符或者是分隔符周围不确定的空格。当你需要更加灵活的切割字符串的时候,最好使用re.split()方法: >>> line = 'asdf fjdk; afed, fjek,asdf, foo' >>> import re ...
string result_1 = my_str[1:-1] print(result_1) # 👉️ 'ppl' # ✅ Remove the first character from a string result_2 = my_str[1:] print(result_2) # 👉️ 'pple' # ✅ Remove the last character from a string result_3 = my_str[:-1] print(result_3) # 👉️ '...
>>> symbols[-1] # Last character ? >>> symbols[-2] # Negative indices are from end of string ? >>> 在Python 语言中,字符串是只读的。 尝试通过将 symbols 字符串的第一个字符变为小写字母 ‘a’ 来验证这一点。 >>> symbols[0] = 'a' Traceback (most recent call last): File "<stdi...
6–6. 字符串.创建一个 string.strip()的替代函数:接受一个字符串,去掉它前面和后面的 空格(如果使用 string.*strip()函数那本练习就没有意义了) 1 'Take a string and remove all leading and trailing whitespace' 2 3 def newStrip(str):