Das deutsche Python-Forum

Code: Alles auswählen

with open('A') as big, open('B') as small, open('C', 'w') as new:
    new.writelines(line for line in small if line not in set(big))

Code: Alles auswählen

In [41]: !cat test.txt
one
two
three

In [42]: f = open('test.txt')

In [43]: set(f)
Out[43]: {'one\n', 'three\n', 'two\n'}

In [44]: set(f)
Out[44]: set()

In [45]: set(f)
Out[45]: set()

In [46]: f.close()

Code: Alles auswählen

$ grep -vf A B > C

Code: Alles auswählen

user=> (use 'clojure.set)
nil
user=> (def large #{"John Schnee" "Margaery Tyrell" "Robb Stark"})
#'user/large
user=> (def small #{"Tyrion Lannister" "John Schnee"})
#'user/small
user=> (difference small large)
#{"Tyrion Lannister"}

Code: Alles auswählen

#include <fstream>
#include <string>
#include <unordered_set>

using namespace std;

int main()
{
    string line;
    
    ifstream big_file("A");
    unordered_set<string> big;
    while (getline(big_file, line)) {
        big.insert(line);
    }
    big_file.close();

    ifstream small_file("B");
    ofstream out_file("C");
    while (getline(small_file, line)) {
        if (big.find(line) == big.end()) {
            out_file << line << endl;
        }
    }
    out_file.close();
    small_file.close();

    return 0;
}

Code: Alles auswählen

John Schnee
Margaery Tyrell
Rob Starck

Code: Alles auswählen

John Schnee
Tyrion Lannister

Code: Alles auswählen

(use 'clojure.set)
(use '[clojure.string :only (split)])
(def small (apply hash-set (split (slurp "small.txt") #"\n")))
(def large (apply hash-set (split (slurp "large.txt") #"\n")))
(println (difference small large))