import pandas as pd
import matplotlib.pyplot as plt
%matplotlib inline

df = pd.read_csv('turnstile_180901.txt')
print(len(df))
df.head()

197625

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    vertical-align: top;
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#Your code here

#Your code here

# Your code here

# Your code here

def clean(col_name):
    cleaned = #Your code here; whatever you want to do to col_name. Hint: think back to str methods.
    return cleaned

#This is a list comprehension. It applies your clean function to every item in the list.
#We then reassign that to df.columns
#You shouldn't have to change anything here.
#Your function above should work appropriately here.
df.columns = [clean(col) for col in df.columns] 

#Checking the output, we can see the results.
df.columns

#Your code here

#Your code here

# Your code here

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