The key to the answer is called object interning. Java interns small numbers (less than 128), so all instances of Integer(n) with n in the interned range are the same. Numbers greater than or equal to 128 are not interned, hence Integer(1000) objects are not equal to each other.
Convert the integer to string first, and then use map to apply int on it: >>> num = 132 >>> map(int, str(num)) #note, This will return a map object in python 3. [1, 3, 2] or using a list comprehension: >>> [int(x) for x in str(num)] [1, 3, 2]
Use str.split(): >>> “42 0″.split() # or .split(” “) [’42’, ‘0’] Note that str.split(” “) is identical in this case, but would behave differently if there were more than one space in a row. As well, .split() splits on all whitespace, not just spaces. Using map usually looks cleaner than using list comprehensions when you … Read more
If you are worried about it growing out of bounds too quickly, I would set the PK as an UNSIGNED BIGINT. That gives you a max value of 18446744073709551615, which should be sufficient.
the Integer class is provided so that values can be boxed/unboxed in a pure OO manner. use int where appropriate unless you specifically need to use it in an OO way; in which case Integer is appropriate. Java Int vs Integer However, very different things are going on under the covers here. An int is … Read more
A pretty fast one might be something like this: int IntPow(int x, uint pow) { int ret = 1; while ( pow != 0 ) { if ( (pow & 1) == 1 ) ret *= x; x *= x; pow >>= 1; } return ret; } Note that this does not allow negative powers. … Read more
Character.getNumericValue(c) The java.lang.Character.getNumericValue(char ch) returns the int value that the specified Unicode character represents. For example, the character ‘\u216C’ (the roman numeral fifty) will return an int with a value of 50. The letters A-Z in their uppercase (‘\u0041’ through ‘\u005A’), lowercase (‘\u0061’ through ‘\u007A’), and full width variant (‘\uFF21’ through ‘\uFF3A’ and ‘\uFF41’ through … Read more
mt_rand() / mt_getrandmax(); Avoid the rand() function, since it usually depends on the platform’s C rand() implementation, generally creating numbers with a very simple pattern. See this comment on php.net Update: In php 7.1 the rand()has been changed and is now merely an alias of mt_rand(). Therefore it is now ok to use rand(), too.
No, you can’t, at least with current version of NumPy. A nan is a special value for float arrays only. There are talks about introducing a special bit that would allow non-float arrays to store what in practice would correspond to a nan, but so far (2012/10), it’s only talks. In the meantime, you may … Read more