大约有 44,000 项符合查询结果（耗时：0.0568秒） [XML]
Downcasting in Java
Upcasting is allowed in Java, however downcasting gives a compile error.
11 Answers
1...
Iterate a list as pair (current, next) in Python
I sometimes need to iterate a list in Python looking at the "current" element and the "next" element. I have, till now, done so with code like:
...
Check if a Class Object is subclass of another Class Object in Java
I'm playing around with Java's reflection API and trying to handle some fields. Now I'm stuck with identifying the type of my fields. Strings are easy, just do myField.getType().equals(String.class) . The same applies for other non-derived classes. But how do I check derived classes? E.g. LinkedLi...
Group by multiple columns in dplyr, using string vector input
I'm trying to transfer my understanding of plyr into dplyr, but I can't figure out how to group by multiple columns.
9 Answ...
What's the meaning of interface{}?
I'm new to interfaces and trying to do SOAP request by github
6 Answers
6
...
Double Iteration in List Comprehension
In Python you can have multiple iterators in a list comprehension, like
10 Answers
10
...
How do I get the row count of a pandas DataFrame?
I'm trying to get the number of rows of dataframe df with Pandas, and here is my code.
14 Answers
...
Fastest way to check if a value exists in a list
What is the fastest way to know if a value exists in a list (a list with millions of values in it) and what its index is?
1...
What is the difference between Ruby 1.8 and Ruby 1.9
I'm not clear on the differences between the "current" version of Ruby (1.8) and the "new" version (1.9). Is there an "easy" or a "simple" explanation of the differences and why it is so different?
...
How to convert a string with comma-delimited items to a list in Python?
How do you convert a string into a list?
14 Answers
14
...