吴裕雄--天生自然 python数据分析:葡萄酒分析
2024-10-08 22:34:28
# import pandas
import pandas as pd # creating a DataFrame
pd.DataFrame({'Yes': [50, 31], 'No': [101, 2]})
# another example of creating a dataframe
pd.DataFrame({'Bob': ['I liked it.', 'It was awful.'], 'Sue': ['Pretty good.', 'Bland']})
pd.DataFrame({'Bob': ['I liked it.', 'It was awful.'],
'Sue': ['Pretty good.', 'Bland.']},
index = ['Product A', 'Product B'])
# creating a pandas series
pd.Series([1, 2, 3, 4, 5])
# we can think of a Series as a column of a DataFrame.
# we can assign index values to Series in same way as pandas DataFrame
pd.Series([10, 20, 30], index=['2015 sales', '2016 sales', '2017 sales'], name='Product A')
# reading a csv file and storing it in a variable
wine_reviews = pd.read_csv("F:\\kaggleDataSet\\wine-reviews\\winemag-data-130k-v2.csv")
# we can use the 'shape' attribute to check size of dataset
wine_reviews.shape
# To show first five rows of data, use 'head()' method
wine_reviews.head()
wine_reviews = pd.read_csv("F:\\kaggleDataSet\\wine-reviews\\winemag-data-130k-v2.csv", index_col=0)
wine_reviews.head()
wine_reviews.head().to_csv("F:\\wine_reviews.csv")
import pandas as pd
reviews = pd.read_csv("F:\\kaggleDataSet\\wine-reviews\\winemag-data-130k-v2.csv", index_col=0)
pd.set_option("display.max_rows", 5)
reviews
# access 'country' property (or column) of 'reviews'
reviews.country
# Another way to do above operation
# when a column name contains space, we have to use this method
reviews['country']
# To access first row of country column
reviews['country'][0]
# returns first row
reviews.iloc[0]
# returns first column (country) (all rows due to ':')
reviews.iloc[:, 0]
# retruns first 3 rows of first column
reviews.iloc[:3, 0]
# we can pass a list of indices of rows/columns to select
reviews.iloc[[0, 1, 2, 3], 0]
# We can also pass negative numbers as we do in Python
reviews.iloc[-5:]
# To select first entry in country column
reviews.loc[0, 'country']
# select columns by name using 'loc'
reviews.loc[:, ['taster_name', 'taster_twitter_handle', 'points']]
# 'set_index' to the 'title' field
reviews.set_index('title')
# 1. Find out whether wine is produced in Italy
reviews.country == 'Italy'
# 2. Now select all wines produced in Italy
reviews.loc[reviews.country == 'Italy'] #reviews[reviews.country == 'Italy']
# Add one more condition for points to find better than average wines produced in Italy
reviews.loc[(reviews.country == 'Italy') & (reviews.points >= 90)] # use | for 'OR' condition
reviews.loc[reviews.country.isin(['Italy', 'France'])]
reviews.loc[reviews.price.notnull()]
reviews['critic'] = 'everyone'
reviews.critic
# using iterable for assigning
reviews['index_backwards'] = range(len(reviews), 0, -1)
reviews['index_backwards']
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