大约有 19,000 项符合查询结果（耗时：0.0341秒） [XML]
Python: TypeError: cannot concatenate 'str' and 'int' objects [duplicate]
... a: 3
Enter b: 7
a + b as strings: 37
a + b as integers: 10
with:
a = raw_input("Enter a: ")
b = raw_input("Enter b: ")
print "a + b as strings: " + a + b # + everywhere is ok since all are strings
a = int(a)
b = int(b)
c = a + b
print "a + b as integers: ", c
...
Why do I get TypeError: can't multiply sequence by non-int of type 'float'?
...
raw_input returns a string (a sequence of characters). In Python, multiplying a string and a float makes no defined meaning (while multiplying a string and an integer has a meaning: "AB" * 3 is "ABABAB"; how much is "L" * 3.1...
How do you suppress output in IPython Notebook?
...ut, but the %%capture magic can be used to save the output to a variable - consult the docs
share
|
improve this answer
|
follow
|
...
SignalR: Why choose Hub vs. Persistent Connection?
...sistent connections you have to embed the message type in the payload (see Raw sample) but hubs gives you the ability to do RPC over a connection (lets you call methods on on the client from the server and from the server to the client). Another big thing is model binding. Hubs allow you to pass str...
How to declare std::unique_ptr and what is the use of it?
...
The constructor of unique_ptr<T> accepts a raw pointer to an object of type T (so, it accepts a T*).
In the first example:
unique_ptr<int> uptr (new int(3));
The pointer is the result of a new expression, while in the second example:
unique_ptr<double>...
How to enumerate an enum with String type?
... code will print all possible values:
Suit.allCases.forEach {
print($0.rawValue)
}
Compatibility with earlier Swift versions (3.x and 4.x)
If you need to support Swift 3.x or 4.0, you may mimic the Swift 4.2 implementation by adding the following code:
#if !swift(>=4.2)
public protocol Case...
Show Image View from file path?
...ant to copy paste this code because you are essentially loading the entire raw image into memory. The image should be resized and loaded into memory in the background. Then the image should be set to the ImageView.
– toidiu
Oct 23 '14 at 20:58
...
Python non-greedy regexes
...d length.
However, if you really do need non-greedy repetition, I suggest consulting the all-powerful ?. This, when placed after at the end of any regex repetition specifier, will force that part of the regex to find the least amount of text possible.
That being said, I would be very careful with ...
How to split a string literal across multiple lines in C / Objective-C?
...e, change your .m file to .mm so that it becomes Objective-C++ and use C++ raw literals, like this:
const char *sql_query = R"(SELECT word_id
FROM table1, table2
WHERE table2.word_id = table1.word_id
ORDER BY table1.wo...
How do you read from stdin?
...s for this to work.)
If you want to prompt the user for input, you can use raw_input in Python 2.X, and just input in Python 3.
If you actually just want to read command-line options, you can access them via the sys.argv list.
You will probably find this Wikibook article on I/O in Python to be a...