python中iterable和iterator(补充enumerate函数) iterable:可迭代对象 可以一个一个的返回它的成员,比如list,str,tuple,dict,file objects 它可以在for loop种使用,for loop in后面接的必须是一个可迭代对象 iterator:迭代器 是一个表示数据流的对象,可以使用next函数不断的从这个对象里面获取新的数据 前者是一个数据...
fori, tinenumerate(zip(names, ages)):print(i, t[0], t[1])# 0 Alice 24# 1 Bob 50# 2 Charlie 18 Other itertools.product() && List comprehensions for loop in Python (with range, enumerate, zip, etc.) itertools.count(), itertools.cycle(), and itertools.repeat() ...
Python >>>forcount,(one,two,three)inenumerate(zip(first,second,third)):...print(count,one,two,three)...0 a d g1 b e h2 c f i In theforloop in this example, you nestzip()insideenumerate(). This means that each time theforloop iterates,enumerate()yields a tuple with the first...
# write your for loop here for label, x, y, z in zip(labels, x_coord, y_coord, z_coord): points.append(label+": " + str(x) + ', ' + str(y) + ', ' + str(z)) for point in points: print(point) 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 输出如下: F: 23, 677, ...
Enumerating through a For-Loop Conclusion In this tutorial, we'll discuss what the enumerate() function in Python is, when it's used, what kind of objects it creates, what syntax it has, and how it works. Then, we'll see some examples of enumerating different types of objects in Python...
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The for loop unpacks each pair into index and fruit, which we then use in the print statement. enumerate also takes an optional second argument, which is the start index. By default, it starts at 0, but you can change this if needed: python fruits = ['apple', 'banana', 'cherry']...
for linenum, line in enumerate(source,1): print linenum, line (Python猫注:这篇文档说 enumerate 没有起止参数,然而,在后续版本中(例如我用的 3.9),它支持使用一个可选的 start 参数!我暂未查到这个变更是在何时加入的,如有知情者,烦请告知我,以便修正!) ...
To learn more about loops, visitPython for loop. Access the Next Element In Python, we can use thenext()function to access the next element from an enumerated sequence. For example, grocery = ['bread','milk','butter'] enumerateGrocery = enumerate(grocery) ...
fruits=['apple','banana','orange']forindex,fruitinenumerate(fruits):ifindex==len(fruits)-1:print(fruit,"is the last fruit.")else:print(fruit) 1. 2. 3. 4. 5. 6. 7. 运行以上代码,输出结果为: apple banana orange is the last fruit. ...