I updated the script, fixed the bug with the increasing PSAR value and also overlapping PSAR with high/low price. Now this function gives the exact same PSAR like TradingView.

def PSAR(df, af=0.02, max=0.2):
df.loc[0, 'AF'] = 0.02
df.loc[0, 'PSAR'] = df.loc[0, 'low']
df.loc[0, 'EP'] = df.loc[0, 'high']
df.loc[0, 'PSARdir'] = "bull"

for a in range(1, len(df)):
    if df.loc[a-1, 'PSARdir'] == 'bull':
        df.loc[a, 'PSAR'] = df.loc[a-1, 'PSAR'] + (df.loc[a-1, 'AF']*(df.loc[a-1, 'EP']-df.loc[a-1, 'PSAR']))
        df.loc[a, 'PSARdir'] = "bull"

        if df.loc[a, 'low'] < df.loc[a-1, 'PSAR'] or df.loc[a, 'low'] < df.loc[a, 'PSAR']:
            df.loc[a, 'PSARdir'] = "bear"
            df.loc[a, 'PSAR'] = df.loc[a-1, 'EP']
            df.loc[a, 'EP'] = df.loc[a-1, 'low']
            df.loc[a, 'AF'] = af
        else:
            if df.loc[a, 'high'] > df.loc[a-1, 'EP']:
                df.loc[a, 'EP'] = df.loc[a, 'high']
                if df.loc[a-1, 'AF'] <= 0.18:
                    df.loc[a, 'AF'] =df.loc[a-1, 'AF'] + af
                else:
                    df.loc[a, 'AF'] = df.loc[a-1, 'AF']
            elif df.loc[a, 'high'] <= df.loc[a-1, 'EP']:
                df.loc[a, 'AF'] = df.loc[a-1, 'AF']
                df.loc[a, 'EP'] = df.loc[a-1, 'EP']

    elif df.loc[a-1, 'PSARdir'] == 'bear':
        df.loc[a, 'PSAR'] = df.loc[a-1, 'PSAR'] - (df.loc[a-1, 'AF']*(df.loc[a-1, 'PSAR']-df.loc[a-1, 'EP']))
        df.loc[a, 'PSARdir'] = "bear"

        if df.loc[a, 'high'] > df.loc[a-1, 'PSAR'] or df.loc[a, 'high'] > df.loc[a, 'PSAR']:
            df.loc[a, 'PSARdir'] = "bull"
            df.loc[a, 'PSAR'] = df.loc[a-1, 'EP']
            df.loc[a, 'EP'] = df.loc[a-1, 'high']
            df.loc[a, 'AF'] = af
        else:
            if df.loc[a, 'low'] < df.loc[a-1, 'EP']:
                df.loc[a, 'EP'] = df.loc[a, 'low']
                if df.loc[a-1, 'AF'] < max:
                    df.loc[a, 'AF'] = df.loc[a-1, 'AF'] + af
                else:
                    df.loc[a, 'AF'] = df.loc[a-1, 'AF']

            elif df.loc[a, 'low'] >= df.loc[a-1, 'EP']:
                df.loc[a, 'AF'] = df.loc[a-1, 'AF']
                df.loc[a, 'EP'] = df.loc[a-1, 'EP']
return df