[Python] Pandas KeyError that Unexplainable

I'm a beginner in the Machine learning scope and currently i'm working with pandas. Im using macOs, Anaconda where i create the environment then launch Jupyter notebook

i encountered the same problem with different Dataframes.

1/First DataFrame i did a small dataset like this

df=pd.read_csv('motor.csv')
df


DataSet

listing the columns names:

df.columns


gives --> Index(['Cars ', 'Bicycles', 'Truck', 'Motobikes'], dtype='object')

however, when i want to print the values of any columns i get this Error

df['Cars']


[Error 1], however, i did the same for lets say Truck column it will work

NOW i moved to a real ML project: with the same frustrating error

I have this dataset that i loaded to my proj

cols=['fLength','fWidth','fSize','fConc','fConc1','fAsym','fM3Long','fM3Trans','fAlpha','fDist','class']


df=pd.read_csv('magic04.data', names=cols)


Dataset2

df['class'].unique()


output: array(['g', 'h'], dtype=object)

Now i want to convert these strings to integers

df['class']=(df['class' == "g"]).astype(int)


and boom i met with the same error Error2

Did i do wrong with my code or is it Anaconda ?

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