From 27cafcd10c379146e18f4e6574821b650ef3aa5d Mon Sep 17 00:00:00 2001 From: guanjihuan Date: Wed, 16 Mar 2022 19:37:32 +0800 Subject: [PATCH] update --- .../cmath_example.py | 2 ++ .../copy_example.py | 26 +++++++++++++++++++ .../functools_example.py | 7 +++++ .../math_example.py | 13 ++++++++++ .../matplotlib_example.py | 8 ++++++ .../multiprocessing_example.py | 23 ++++++++++++++++ .../numpy_example.py | 21 +++++++++++++++ .../os_example.py | 6 +++++ .../time_example.py | 5 ++++ 9 files changed, 111 insertions(+) create mode 100644 language_learning/2022.03.16_frequently_used_python_package/cmath_example.py create mode 100644 language_learning/2022.03.16_frequently_used_python_package/copy_example.py create mode 100644 language_learning/2022.03.16_frequently_used_python_package/functools_example.py create mode 100644 language_learning/2022.03.16_frequently_used_python_package/math_example.py create mode 100644 language_learning/2022.03.16_frequently_used_python_package/matplotlib_example.py create mode 100644 language_learning/2022.03.16_frequently_used_python_package/multiprocessing_example.py create mode 100644 language_learning/2022.03.16_frequently_used_python_package/numpy_example.py create mode 100644 language_learning/2022.03.16_frequently_used_python_package/os_example.py create mode 100644 language_learning/2022.03.16_frequently_used_python_package/time_example.py diff --git a/language_learning/2022.03.16_frequently_used_python_package/cmath_example.py b/language_learning/2022.03.16_frequently_used_python_package/cmath_example.py new file mode 100644 index 0000000..9b677c0 --- /dev/null +++ b/language_learning/2022.03.16_frequently_used_python_package/cmath_example.py @@ -0,0 +1,2 @@ +import cmath +print(cmath.exp(1j*cmath.pi)) \ No newline at end of file diff --git a/language_learning/2022.03.16_frequently_used_python_package/copy_example.py b/language_learning/2022.03.16_frequently_used_python_package/copy_example.py new file mode 100644 index 0000000..24ae751 --- /dev/null +++ b/language_learning/2022.03.16_frequently_used_python_package/copy_example.py @@ -0,0 +1,26 @@ +import copy +import numpy as np + +array_1 = [1, 2, 3] +array_2 = array_1 +array_1[0] = 100 +print('array_1=', array_1) +print('array_2=', array_2, '\n') + +array_1 = np.array([1, 2, 3]) +array_2 = array_1 +array_1[0] = 100 +print('array_1=', array_1) +print('array_2=', array_2, '\n') + +array_1 = [1, 2, 3] +array_2 = copy.deepcopy(array_1) +array_1[0] = 100 +print('array_1=', array_1) +print('array_2=', array_2, '\n') + +array_1 = np.array([1, 2, 3]) +array_2 = copy.deepcopy(array_1) +array_1[0] = 100 +print('array_1=', array_1) +print('array_2=', array_2) \ No newline at end of file diff --git a/language_learning/2022.03.16_frequently_used_python_package/functools_example.py b/language_learning/2022.03.16_frequently_used_python_package/functools_example.py new file mode 100644 index 0000000..0656679 --- /dev/null +++ b/language_learning/2022.03.16_frequently_used_python_package/functools_example.py @@ -0,0 +1,7 @@ +import functools + +def func(x, y, z): + return x-y+z + +partial_func = functools.partial(func, x=5, z=0) +print(partial_func(y=2)) \ No newline at end of file diff --git a/language_learning/2022.03.16_frequently_used_python_package/math_example.py b/language_learning/2022.03.16_frequently_used_python_package/math_example.py new file mode 100644 index 0000000..c5be0d8 --- /dev/null +++ b/language_learning/2022.03.16_frequently_used_python_package/math_example.py @@ -0,0 +1,13 @@ +import math +print(math.pi) +print(math.e) +print(math.exp(1)) +print(math.cos(math.pi)) +print(math.sqrt(2), '\n') + +import numpy as np +print(np.pi) +print(np.e) +print(np.exp(1)) +print(np.cos(np.pi)) +print(np.sqrt(2)) \ No newline at end of file diff --git a/language_learning/2022.03.16_frequently_used_python_package/matplotlib_example.py b/language_learning/2022.03.16_frequently_used_python_package/matplotlib_example.py new file mode 100644 index 0000000..3625d58 --- /dev/null +++ b/language_learning/2022.03.16_frequently_used_python_package/matplotlib_example.py @@ -0,0 +1,8 @@ +import matplotlib.pyplot as plt +fig = plt.figure() +ax = fig.add_subplot(111) +ax.plot(range(10), range(10)) +ax.set_title('Example', fontsize=20, fontfamily='Times New Roman') +ax.set_xlabel('x', fontsize=20, fontfamily='Times New Roman') +ax.set_ylabel('y', fontsize=20, fontfamily='Times New Roman') +plt.show() \ No newline at end of file diff --git a/language_learning/2022.03.16_frequently_used_python_package/multiprocessing_example.py b/language_learning/2022.03.16_frequently_used_python_package/multiprocessing_example.py new file mode 100644 index 0000000..f6759c5 --- /dev/null +++ b/language_learning/2022.03.16_frequently_used_python_package/multiprocessing_example.py @@ -0,0 +1,23 @@ +from multiprocessing import Process +import time + +def f(name): + time.sleep(5) + print('Hello', name) + +if __name__ == '__main__': + start_time = time.time() + p1 = Process(target=f, args=('Bob',)) + p2 = Process(target=f, args=('Alice',)) + p1.start() + p2.start() + p1.join() + p2.join() + end_time = time.time() + print(end_time - start_time, '\n') + + start_time = time.time() + f('Bob') + f('Alice') + end_time = time.time() + print(end_time - start_time) \ No newline at end of file diff --git a/language_learning/2022.03.16_frequently_used_python_package/numpy_example.py b/language_learning/2022.03.16_frequently_used_python_package/numpy_example.py new file mode 100644 index 0000000..64e20ae --- /dev/null +++ b/language_learning/2022.03.16_frequently_used_python_package/numpy_example.py @@ -0,0 +1,21 @@ +import numpy as np +np.zeros((2, 3)) # 零矩阵 +np.identity(3) # 单位矩阵 +np.diag([1, 3, 5]) # 对角矩阵 +matrix1 = np.array([[3, 5+1j], [2, 7]]) # numpy矩阵 +matrix1.shape # 矩阵的维度 +matrix1.transpose() # 矩阵转置 +matrix1.conj() # 矩阵所有元素共轭 +np.conj(matrix1) # 矩阵所有元素共轭（同上） +np.arange(1, 5, 1) # 数列（左闭右开） +np.linspace(-2, 2, 5) # 数列（左闭右闭） +np.random.uniform(-2, 2) # 随机数 +np.random.randint(0, 2) # 随机整数（左闭右开） +np.sort([1, 7, 0, 3]) # 排列 +np.argsort([1, 7, 0, 3]) # 排列索引 +np.linalg.det(matrix1) # 行列式 +matrix2 = np.linalg.inv(matrix1) # 求逆 +np.matmul(matrix1, matrix2) # 矩阵乘积 +np.dot(matrix1, matrix2) # 矩阵乘积（同上） +eigenvalue, eigenvector = np.linalg.eig(matrix1) # 求本征值，本征向量 +matrix3 = np.append(matrix1, matrix2, axis=0) # 增加数组元素或者矩阵的行 \ No newline at end of file diff --git a/language_learning/2022.03.16_frequently_used_python_package/os_example.py b/language_learning/2022.03.16_frequently_used_python_package/os_example.py new file mode 100644 index 0000000..f282be1 --- /dev/null +++ b/language_learning/2022.03.16_frequently_used_python_package/os_example.py @@ -0,0 +1,6 @@ +import os +os.getcwd() # 获取路径 +if os.path.exists('new_dir') == False: # 判断路径是否存在 + os.makedirs('new_dir') # 新建文件夹 +os.chdir('new_dir') # 切换到该文件夹 +print(os.walk('/')) # 游走目录 \ No newline at end of file diff --git a/language_learning/2022.03.16_frequently_used_python_package/time_example.py b/language_learning/2022.03.16_frequently_used_python_package/time_example.py new file mode 100644 index 0000000..25e8d43 --- /dev/null +++ b/language_learning/2022.03.16_frequently_used_python_package/time_example.py @@ -0,0 +1,5 @@ +import time +start_time = time.time() +time.sleep(5) +end_time = time.time() +print(end_time-start_time) \ No newline at end of file