DeLong links to "Bernard" and Robert Waldmann:
Monday DeLong Smackdown Watch: When Were Expectations of Inflation Forward-Looking? Weblogging
Just to set the historical record straight: Inflation in France topped under the previous (conservative) administration that Mitterands' election threw into opposition. Inflation fell throughout Mitterands first term from 13.4% to 2.7% (see http://france-inflation.com/inflation-depuis-1901.php), even though there were devaluations of the FRF against the DEM (inside what later would become known as the ERM).
Of course any economic historian will remember that the second oil shock linked to the Iranian Revolution took place in 1979-1980 and was rather instrumental for inflationary trends on the one hand, and that the conservative government in France led by R. Barre in the late seventies had abolished price controls on most things.
What Mitterand's election in May 1981 did produce was not inflation, it was instant massive capital flight, which in turn led to a serious current account financing problem by the summer of 1981 as forex reserves collapsed, and that was the immediate reason for the devaluation and the imposition of capital controls. The capital flight of course was linked to political fears as the first socialist administration involved a number of Ministers from the communist party - four as I recall, mostly in junior positions - and a number of industries (mostly banks) were to be nationalised.