擅长:python、mysql、java
<p>我给你举个例子。在</p>
<pre><code>import pandas as pd
# reading csv
s = pd.read_csv("stock.csv", squeeze = True)
# defining function to check price
def fun(num):
if num<200:
return "Low"
elif num>= 200 and num<400:
return "Normal"
else:
return "High"
# passing function to apply and storing returned series in new
new = s.apply(fun)
# printing first 3 element
print(new.head(3))
# printing elements somewhere near the middle of series
print(new[1400], new[1500], new[1600])
# printing last 3 elements
print(new.tail(3))
</code></pre>
<p><img src="https://i.stack.imgur.com/2bmOe.png" alt="Here is the output"/></p>