Python join - 如何在循环中加入数据？

Question

我怎样才能加入下面的数据，

# Convert Spark DataFrame to Pandas
pandas_df = df.toPandas()
print pandas_df

   age     name
0  NaN  Michael
1   30     Andy
2   19   Justin

我目前的尝试，

persons = ""

for index, row in pandas_df.iterrows():
    persons += str(row['name']) + ", " + str(row['age']) + "/ "
    print row['name'], row['age']

print persons

结果，

Michael, nan/ Andy, 30.0/ Justin, 19.0/ 

但我在(末尾没有斜杠)之后，

Michael, nan/ Andy, 30.0/ Justin, 19.0

Answer 1

如果你想保留循环遍历 each 的方法，那么你可以简单地删除最后一个 / ，方法是对其执行 rstrip() 从右侧剥离.示例 -

persons = ""

for index, row in pandas_df.iterrows():
    persons += str(row['name']) + ", " + str(row['age']) + "/ "
    print row['name'], row['age']

person = person.rstrip("/ ")
print persons

示例/演示 -

>>> person = "Michael, nan/ Andy, 30.0/ Justin, 19.0/ "
>>> person = person.rstrip('/ ')
>>> person
'Michael, nan/ Andy, 30.0/ Justin, 19.0'

---

但是如果你真的不想在循环中使用print row['name'], row['age']，那么你可以把它转换成一个生成器函数，然后让 str.join() 处理你想要的。示例 -

person = "/".join(",".join([str(row['name']), str(row['age'])]) for _, row in pandas_df.iterrows())