You have four main options for converting types in pandas: to_numeric() – provides functionality to safely convert non-numeric types (e.g. strings) to a suitable numeric type. (See also to_datetime() and to_timedelta().) astype() – convert (almost) any type to (almost) any other type (even if it’s not necessarily sensible to do so). Also allows you to convert to categorial types (very useful). infer_objects() – … Read more
How do I see the type of a variable whether it is unsigned 32 bit, signed 16 bit, etc.? How do I view it?
It means: Source. The first character specifies the kind of data and the remaining characters specify the number of bytes per item, except for Unicode, where it is interpreted as the number of characters. The item size must correspond to an existing type, or an error will be raised. The supported kinds are to an … Read more
It means: Source. The first character specifies the kind of data and the remaining characters specify the number of bytes per item, except for Unicode, where it is interpreted as the number of characters. The item size must correspond to an existing type, or an error will be raised. The supported kinds are to an … Read more
TL;DR You want this: Mappings The YAML equivalent of a JSON object is a mapping, which looks like these: Note that the first characters of the keys in a block mapping must be in the same column. To demonstrate: Sequences The equivalent of a JSON array in YAML is a sequence, which looks like either … Read more
A C++ question, I know foo will return a pointer to int type how about what does it return? Thank a lot!
uintptr_t is an unsigned integer type that is capable of storing a data pointer. Which typically means that it’s the same size as a pointer. It is optionally defined in C++11 and later standards. A common reason to want an integer type that can hold an architecture’s pointer type is to perform integer-specific operations on a … Read more
Long is the Object form of long, and Integer is the object form of int. The long uses 64 bits. The int uses 32 bits, and so can only hold numbers up to ±2 billion (-231 to +231-1). You should use long and int, except where you need to make use of methods inherited from Object, such as hashcode. Java.util.collections methods usually use the boxed (Object-wrapped) versions, because they need to work for any Object, and … Read more
When the compiler compiles the class User and gets to the MyMessageBox line, MyMessageBox has not yet been defined. The compiler has no idea MyMessageBox exists, so cannot understand the meaning of your class member. You need to make sure MyMessageBox is defined before you use it as a member. This is solved by reversing the definition order. However, you have a cyclic dependency: if you move MyMessageBox above User, … Read more
I don’t understand what the problem is with the code, it is very simple so this is an easy one. It gives me an error As an example, if x is 3 and y is 14, I want it to print What is the problem?