python入门学习(五 字符串string和变量variable) 1.字符串 一串字符显示或者打印出来文字信息 双引号,单引号,三引号 双引号:解析功能 单引号:无 三引号:保存文本格式 Format方法 age = 3name="jason"print("{0} was {1} years old".format(name, age))print(name +"was"+ str(age) +"years old") 2.字面常量(不会改变) 可以直接以...
t = string.Template(""" Variable : $var Escape : $$ Variable in text: ${var}iable """) print('TEMPLATE:', t.substitute(values)) s = """ Variable : %(var)s Escape : %% Variable in text: %(var)siable """ print('INTERPOLATION:', s % values) S = """ Variable : {var}...
print(count) # error: local variable 'count' referenced before assignment count = 3 func() count = 1 def func(): print(count) # No error, function can find global variable 'count' func() 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 二、关键字 global nonlocal 1.g...
In this tutorial, you'll learn how to remove or replace a string or substring. You'll go from the basic string method .replace() all the way up to a multi-layer regex pattern using the sub() function from Python's re module.
使用f字符串中以{variable_name}插值变量. 代码语言:javascript 代码运行次数:0 运行 AI代码解释 name='Yang'title='full stack hacker'print(f'{name} is a {title}.')# Yang is a full stack hacker. 如上所示,在 f 字符串机制的帮助下,我们可以编写简单且更少的代码,以便在字符串中显示更多代码。它...
python string to variable example: exec:执行字串语句 >>> l=[12,3,4,4] >>> s = 'l.append(10)' >>> exec(s) >>> s 'l.append(10)' >>> l [12, 3, 4, 4, 10] >>> eval:让字串变成与之对应的变量名 >>> str = 'good'...
python3 string_template.py TEMPLATE:Variable: foo Escape: $Variablein text: fooiableINTERPOLATION:Variable: fooEscape: %Variablein text: fooiableFORMAT:Variable: fooEscape: {}Variablein text: fooiable 模板与标准字符串拼接的重要区别是模板不考虑参数类型。模板中值会转换为字符串且没有提供格式化选项。例...
The placeholder for the variable in the string is%s. After the string, use another%character followed by the variable name. The following example shows how to format by using the%character: Python mass_percentage ="1/6"print("On the Moon, you would weigh about %s of your weight on Earth...
Python 'Py''thon' The output is: Output 'Python' However, to concatenate variables or a variable and a literal, use the plus ("+") operator: Python prefix ='Py'prefix +'thon' The output is: Output 'Python' Next unit: String indexing ...
使用f字符串中以{variable_name}插值变量. name = 'Yang' title = 'full stack hacker' print(f'{name} is a {title}.') # Yang is a full stack hacker. 如上所示,在 f 字符串机制的帮助下,我们可以编写简单且更少的代码,以便在字符串中显示更多代码。它完美地呼应了 Python 的禅宗。 "简单总比...