在Python中,if else语句是一种条件控制语句,它可以根据条件的真假来执行不同的代码块。当有多个条件需要判断时,我们可以使用多个if else语句来实现复杂的逻辑。 基本语法 if else语句的基本语法如下: ifcondition1:# do somethingelifcondition2:# do somethingelse:# do something 1. 2. 3. 4. 5. 6. 在这...
1.三元操作符(Ternary operator) 三元操作符是if-else语句的简写形式。其语法为value_if_true if condition else value_if_false。这是一个一行的代码,可以替代多行的if-else语句,使你的代码更加简洁: a = 5 b = 10 max = a if a > b else b ## value_if_true if condition else value_if_false ...
1: if (condition) and (condition): 2: #execute code here 3: elif (condition) or (condition): 4: #execute code here 5: else(condition): 6: #execute code here When executing multiple conditional statements, order of precedence of operators is important. The order of precedence is as foll...
One line if else statement: a =2 b =330 print("A")ifa > belseprint("B") Try it Yourself » This technique is known asTernary Operators, orConditional Expressions. You can also have multiple else statements on the same line:
print("first print")ifcondition:print(“secondprint”)print(“thirdprint”) 在这个例子中,我们可以看到以下内容: 以下语句:print("first print"),if condition:,print("third print")具有相同的缩进级别,并且始终被执行。 在if语句之后,有一个缩进级别更高的代码块,其中包括print ("second print")语句。
# method 5 put multiple variables in a list aliens = [] for alien_num in range(11111): new_alien = {'color': 'green'} aliens.append(new_alien) globals()[v+'file'] == eval(v+'file') # eval是function call,不能assign # delete key # This will return my_dict[key] if key exis...
installalso creates${prefix}/bin/python3which refers to${prefix}/bin/python3.X. If you intend to install multiple versions using the same prefix you must decide which version (if any) is your "primary" version. Install that version usingmake install. Install all other versions usingmake ...
def concat_col_str_condition(df):# concat 2 columns with strings if the last 3 letters of the first column are 'pil' mask = df['col_1'].str.endswith('pil', na=False) col_new = df[mask]['col_1'] + df[mask]['col_2'] col_new.replace('pil', ' ', regex=True,...
# it what's called a"new-style class".# Multiple inheritance is declaredas: #classOtherClass(MyClass1, MyClass2, MyClassN)classOtherClass(MyClass): # The"self"argument is passed automatically # and refers to theclassinstance, so you canset# instance variablesasabove, but from inside the...
name="ali"age=22# bad practicesifname:print(name)ifname and age>18:print("user is verified") 但是更好的处理方法如下: 代码语言:javascript 复制 # a better approachprint(nameifnameelse"")""" here you have to define the else condition too"""# good practice ...