#Python, pandas #Obtain a dataframe df containing only the rows where "column1" is null (NaN) df[df['column1'].isnull()]
Here is what the above code is Doing:
1. df[‘column1’].isnull() returns a series of True/False values, where True indicates that the value in that row is null.
2. df[df[‘column1’].isnull()] returns a dataframe containing only the rows where the value in column1 is null.
>>> from datetime import datetime, timedelta >>> datetime.strftime(datetime.now() – timedelta(1), ‘%Y-%m-%d’) ‘2015-05-26’ Here is what the above code is Doing: 1. Importing the datetime module. 2. Creating a datetime object for the current time. 3. Subtracting a timedelta object from the current time. 4. Converting the resulting datetime object to a string. 5. Printing the…
pip install firebase-admin Here is what the above code is Doing: 1. Importing the Firebase Admin SDK. 2. Initializing the app with a service account, granting admin privileges. 3. Initializing the Firestore client with the app.
a_dict = {“color”: “blue”, “fruit”: “apple”, “pet”: “dog”} [value for key, value in a_dict.items()] >>> [‘blue’, ‘apple’, ‘dog’] Here is what the above code is Doing: 1. We create a dictionary with three key-value pairs. 2. We create a list comprehension that iterates through the key-value pairs in the dictionary. 3. We extract the value…
self.MyInput.textChanged.connect(self.doSomething) Here is what the above code is Doing: 1. We create a QLineEdit widget and assign it to the instance variable self.MyInput. 2. We connect the signal textChanged to the slot doSomething. 3. We define the slot doSomething. The slot doSomething is called whenever the text in the QLineEdit widget changes.
class DemoClass: num = 101 # default value of self.num when read_number method called # parameterized constructor def __init__(self, data): self.num = data # a method def read_number(self): print(self.num) Here is what the above code is Doing: 1. We created a class named DemoClass. 2. We created a variable named num and assigned a value…
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