# In this script, we are going to create a 4 functions: add_numbers, sub_numbers, mul_numbers, div_numbers. def add_numbers(x, y):returnx + ydefsub_numbers(x, y):returnx - ydefmul_numbers(x, y):returnx * ydefdiv_numbers(x, y):return(x / y) 在上面的脚本中,我们创建了四...
3]im[im <= 0.5] = 0im[im > 0.5] = 1pylab.gray()pylab.figure(figsize=(18,9))pylab.subplot(131)pylab.imshow(im)pylab.title('original', size=20)pylab.axis('off')for d in range(1,3): pylab.subplot(1,3,
>>>3+2326>>>print"This is a test of the interactive mode"Thisisa test of the interactive mode>>>a =3>>>b =4>>>printa * b12>>>printa + b7>>>exit() 多行语句 你也可以输入缩进的多行语句,如循环的或if语句(这将在后面的章节中讨论)。例如: >>>foriinrange(0,3): ...printi ....
Unit Root Test Thenullhypothesisofthe Augmented Dickey-Fuller is that there is a unit root,withthe alternative that there is no unit root.That is to say the bigger the p-value the more reason we assert that there is a unit root''' def testStationarity(ts): dftest = adfuller(ts) # ...
# How to import numpy import numpy as np # How to check the version of the numpy package print('numpy:', np.__version__) # Checking the available methods print(dir(np)) 使用创建 numpy 数组 创建int numpy 数组 # Creating python List python_list = [1,2,3,4,5] # Checking data typ...
Create a spreadsheet-style pivot table as a DataFrame.DataFrame.pivot : Return reshaped DataFrame organizedby given index / column values.DataFrame.explode : Explode a DataFrame from list-likecolumns to long format.Examples--->>> df = pd.DataFrame({'A': {0: 'a', 1: 'b', 2: 'c'},...
Then you create a 3×4 NumPy array of floating-point numbers with .normal(), which produces normally distributed random numbers. Note: You’ll need to run python -m pip install numpy before typing the above code into your REPL if you don’t already have NumPy in your environment. If ...
append(x)Adds a single element to the end of the array. extend(iterable)Adds a list, array, or other iterable to the end of array. insert(i, x)Inserts an element before the given index of the array. The following example demonstrates how to create a new array object by joining two ...
| If x is outside the integer range, the function returns a long instead. | | If x is not a number or if base is given, then x must be a string or | Unicode object representing an integer literal in the given base. The
for i in range(4): print i """ "range(lower, upper)" returns a list of numbers from the lower number to the upper number prints: 4 5 6 7 """ for i in range(4, 8): print i """ While loops go until a condition is no longer met. ...