s2 = '888888what is your name?' s2 = s2.istitle() print(type(s2),s2) 1. 2. 3. 4. 5. 6. 7. 输出结果: <class 'bool'> True <class 'bool'> False 1. 2. View Code 16、isupper() 描述:判断字符串是否全是大写 参数:无 返回值:返回一个布尔值 示例: s = '88888MY NAME IS WILL...
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>>>from stringimportTemplate>>>s=Template('$who likes $what')>>>s.substitute(who='tim',what='kung pao')'tim likes kung pao'>>>d=dict(who='tim')>>>Template('Give $who $100').substitute(d)Traceback(most recent call last):...ValueError:Invalid placeholderinstring:line1,col11>>>...
[python] view plain copy import decimal for value in [ 'Infinity', 'NaN', '0' ]: print decimal.Decimal(value), decimal.Decimal('-' + value) print # Math with infinity print 'Infinity + 1:', (decimal.Decimal('Infinity') + 1) print '-Infinity + 1:', (decimal.Decimal('-Infinity...
We can't actually do this update in place, but what we can do is first delete the key (del some_dict[5.0]), and then set it (some_dict[5]) to get the integer 5 as the key instead of floating 5.0, though this should be needed in rare cases. How did Python find 5 in a ...
What is your favorite color? It is blue. 如果要逆向循环一个序列,可以先正向定位序列,然后调用 reversed() 函数 >>> >>> for i in reversed(range(1, 10, 2)): ... print(i) ... 9 7 5 3 1 如果要按某个指定顺序循环一个序列,可以用 sorted() 函数,它可以在不改动原序列的基础上返回一...
5W2H分析法又称七何分析法,包括:Why、What、Where、When、Who、How、How much 。主要用于用户行为分析、业务问题专题分析、营销活动等,是一个方便又实用的工具。 1.3 逻辑树分析法 逻辑树是分析问题最常用的工具之一,它是将问题的所有子问题分层罗列,从最高层开始,并逐步向下扩展。使用逻辑树分析的主要优点是保证...
What is Python? Python, the Swiss Army knife of today’s dynamically typed languages, has comprehensive support for common data manipulation and processing tasks, which makes it one of the best programming languages for data science and web development. Python’s native dictionary and list data ty...
What Is a Python KeyError Exception and How to Fix It? Python is a powerful programming language that is used for a wide range of...Read more Getting Started With MongoDB Shell & Basic Commands The MongoDB local shell offers the capability to establish connections to both local and remote....
What's the infinity number ? float('inf') Built-in Types — Python 3.7.4 documentation https://docs.python.org/3/library/stdtypes.html?highlight=float%20inf float also accepts the strings “nan” and “inf” with an optional prefix “+” or “-” for Not a Number (NaN) and posit...