python中dump与dumps的区别

刚写了一个代吗，没有搞懂dump和dumps的区别，现在搞懂了，下班后在来整理
import pickle
q = [1,2,3,4]
pickle.dumpq,open"cb1.txt","wb"))
q2 = pickle.loadopen'cb1.txt',"rb"))
printq2)