python - 列表理解与实例

Question

我正在尝试列表理解，但遇到以下问题。

class Programmer():
    def __init__(self, name, years_at_umich=1, programs_written=0):
        self.name = name
        self.seniority = years_at_umich
        self.bonus_points = random.randrange(1000)
        self.programs_written = programs_written

    def shout(self, phrase_to_shout):
        print phrase_to_shout  # print is for ppl!

    def __str__(self):
        return "My name is {}, and I've been at UMich for about {} years.".format(self.name,self.seniority)

    def year_at_umich(self):
        return self.seniority

prog_tups = zip(names, seniority,programs_written)
print prog_tups

打印输出

[('Albert', 1, 10), ('Bisi', 5, 500), ('Cai', 2, 20), ('Dinesh', 4, 131), ('Euijin', 1, 46)]

我正在尝试使用列表理解从上面的 prog_tups 列表中创建一个 Programmer 实例列表，并将该列表保存在变量 programmers 中。

我当前的代码如下，我没有得到回溯，但什么也没有发生:

programmers = [item for item in prog_tups]

Answer 1

如果您还没有自定义 Programmer 类，请考虑使用 collections.namedtuple子类:

import collections

Programmer = collections.namedtuple('Programmer', 'name seniority programs_written')
prog_tups = [('Albert', 1, 10), ('Bisi', 5, 500), ('Cai', 2, 20), ('Dinesh', 4, 131), ('Euijin', 1, 46)]
programmers = [Programmer(n, s, p) for n,s,p in prog_tups]

# the first programmer
print programmers[0]

输出:

Programmer(name='Albert', seniority=1, programs_written=10)

---

要处理您现有的自定义类，请使用以下方法:

prog_tups = [('Albert', 1, 10), ('Bisi', 5, 500), ('Cai', 2, 20), ('Dinesh', 4, 131), ('Euijin', 1, 46)]
programmers = [Programmer(*t) for t in prog_tups]

# the first programmer
print programmers[0]

输出:

My name is Albert, and I've been at UMich for about 1 years.