A number of students work whilst studying in order to finance their career plans and gain experience. To work at the same time as following the training programme, the student must be exceptionally organized and have a flexible employer.
For foreign students, it is important to be aware that a special visa is sometimes required to work legally in France.
If you are in possession of a long-stay student residence permit, you are allowed to carry out paid work as a secondary occupation during your studies in France (totalling a maximum of 964 hours per year). You do not need any form of authorization. Your employer must declare your employment at the prefecture. In the following 3 cases, however, you must request a work permit: if you are Algerian, or need to work for more than the authorized amount of time, or are in possession of a temporary 6 month visa.
Information on visas: http://www.diplomatie.gouv.fr/fr/venir-en-france/