Question

我有一个变量player_answer，我希望在player_answer等于“是”或“是”时打破while循环。

代码：

while player_answer != "yes" ((OR)) "yea":

            *CODE BLOCK*

Answer 1

如果你想使用两个子句，你可以使用import pandas as pd from pandas import Series,DataFrame import numpy as np import matplotlib.pyplot as plt import seaborn as sns import csv from sklearn.linear_model import LogisticRegression from sklearn.cross_validation import train_test_split from sklearn import metrics from sklearn.decomposition import PCA from sklearn.discriminant_analysis import LinearDiscriminantAnalysis trainDF = pd.DataFrame({'Out': [1, 0, 0, 0, 1, 3, 3], 'Revolver': [0.766, 0.957, 0.658, 0.233, 0.907, 0.1, 0.15], 'Ratio': [0.803, 0.121, 0.085, 0.036, 0.024, 0.6, 0.8], 'Num': [0, 1, 0, 3, 5, 4, 4]}) #drop NA values trainDF = trainDF.dropna() trainDF['Num'].loc[(trainDF['Num']==8) | (trainDF['Num']==17)] = trainDF['Num'].median() # convert dataframe to numpy array y = trainDF['Out'].as_matrix() # convert dataframe to numpy array X = trainDF.drop('Out', 1).as_matrix() target_names = ['out', 'in'] pca = PCA(n_components=2) X_r = pca.fit(X).transform(X) lda = LinearDiscriminantAnalysis(n_components=2) X_r2 = lda.fit(X, y).transform(X) # Percentage of variance explained for each components print('explained variance ratio (first two components): %s' % str(pca.explained_variance_ratio_)) plt.figure() for c, i, target_name in zip("rgb", [0, 1], target_names): plt.scatter(X_r[y == i, 0], X_r[y == i, 1], c=c, label=target_name) plt.legend() plt.title('PCA of Out') plt.figure() for c, i, target_name in zip("rgb", [0, 1], target_names): plt.scatter(X_r2[y == i, 0], X_r2[y == i, 1], c=c, label=target_name) plt.legend() plt.title('LDA of Out') plt.show() / and来表示python复合逻辑。

or

然而，要小心，因为复合条款的否定并不像上面描述的那样简单，因此容易混淆。具体来说，我写的化合物 NOT 等同于

while not (player_answer == "yes" or player_answer == "yea"): 
   <INSERT CODE>

有关详细信息，请查看DeMorgan's Laws。

更好的解决方案是评论中来自@DeveloperXY的解决方案：

# DON'T DO THIS; THIS ILLUSTRATES A COMMON LOGICAL MISTAKE
while player_answer != "yes" or player_answer != "yea":
   <INSERT CODE>

如何在while循环中输入更多条件？

1 个答案: