如何不使用for循环来解决此问题？ （蟒蛇）

Question

我试图在python中解决以下问题，但由于数据库很大（.csv，100.000行），因此需要花费很多时间。 我怎样才能使其更快？

for i in range(len(df)):
if (df["time_choice"][i] < 0.125):
    df["time_choice2"][i] = 1/12
elif (df["time_choice"][i] > 0.125) and (df["time_choice"][i] < 75/125):
    df["time_choice2"]= 1/4
elif (df["time_choice"][i] > 75/125) and  (df["time_choice"][i] < 1.5):
    df["time_choice2"][i] = 1
elif (df["time_choice"] [i]> 1.5) and (df["time_choice"][i] < 2.5) :
    df["time_choice2"][i] = 2
elif (df["time_choice"][i] > 2.5) and  (df["time_choice"][i] < 4) :
    df["time_choice2"][i] = 3
elif (df["time_choice"][i] > 4) and  (df["time_choice"][i] < 7.5) :
    df["time_choice2"][i] = 5
elif (df["time_choice"][i] > 7.5):
    df["time_choice2"][i] = 10