# 例子：创建一个包含键值对的字典my_dict = {"name": "John", "age": 25, "city": "New York"}print(my_dict)4. 选择结构（Selection/Conditional Statements）：选择结构用于根据条件选择执行不同的代码块，Python 中常用的选择结构包括 if、elif 和 else。# 例子：简单的if-else语句num = 10if num ...
The iterable can be any iterable object, including a list, tuple, set, generator, or similar type. The [if condition] part is an optional conditional that you can use to filter existing collections or generate elements conditionally.A set comprehension returns a new set. So, you use them to...
We’ve gone over how to select columns and rows, but what if we want to make a conditional selection? For example, what if we want to filter our movies DataFrame to show only films directed by Ridley Scott or films with a rating greater than or equal to 8.0? To do that, we take ...
index) #np.array() array1.reshape(,) df.values.astype(int).tolist() np.vstack((a1,a2)) np.hstack((a1,a2)) round() iloc #时间索引拆分 # dates=pd.date_range(start='1991-01-01',end='2007-08-01',freq='MS')#日期取值和格式转换,MS代表每月第一天 # years=[d.strftime('%Y-%m')...
In the selection or loop structure, if the value of the conditional expression is not Falsea, 0, None, etc., it will all be regarded as True 1.关系运算符：可连用 1. Relational operators: can be used together 2.不允许使用赋值运算符= 2. The assignment operator = is not allowed 3. ...
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Selection Like most programming languages, Python provides a method for conditional select statements. The IF statement evaluates a logical expression in order to make a decision based on the result of the evaluation. Continuing with our banner-grabbing script, we would like to know if the specific...
Selection.ColumnWidth=4Range("A1").Select End Sub 设置条件格式后的工作表如下图4所示,接近数字100是红色、50是黄色、1是蓝色。 图4 下面是将宏代码转换为Python的一些规则。 1.Selection要添加前缀excel。 2.Range要添加前缀ws,这是前面的代码已经定义过的。
Another useful conditional statement is “for” loop. Using it we can iterate through the items present within an object such as a tuple or list. Example code #!/usr/bin/python sample_tup=(‘23’,’test’,12,’w2’) for items in sample_tup: print items Output 123 test 12 w2 We are...
In the selection or loop structure, if the value of the conditional expression is not Falsea, 0, None, etc., it will all be regarded as True 1.关系运算符:可连用 1. Relational operators: can be used together 2.不允许使用赋值运算符= 2. The assignment operator = is not allowed 3. 逻...