texlive插入python代码出错

Posted 2023-03-28

代码：
\lstsetlanguage = python
\beginlstlisting
import numpy as np
import matplotlib.image as mpimg
import os
from rgb2gray import *
import random
from sklearn.neural_network import MLPClassifier

Dir = "/mnt/win/STUDY/SRTP/OwnCollection/vehicles/Far";
NDir = "/mnt/win/STUDY/SRTP/OwnCollection/non-vehicles/Far";
TestDir = "/mnt/win/STUDY/SRTP/OwnCollection/vehicles/Left"

X_1 = [];
y_1 = [];
cnt_1 = 0;
cnt_0 = 0;
for Img in os.listdir(Dir):
img = mpimg.imread("%s/%s" % (Dir, Img));
img = rgb2gray(img);
img = img.flatten();
X_1.append(img);
y_1.append(1);
cnt_1 += 1;

for Img in os.listdir(NDir):
img = mpimg.imread("%s/%s" % (NDir, Img));
img = rgb2gray(img);
img = img.flatten();
X_1.append(img);
y_1.append(0);
cnt_0 += 1;

X = [];
y = [];
RanInd = range(0, len(X_1));
random.shuffle(RanInd);

for i in RanInd:
X.append(X_1[i]);
y.append(y_1[i]);

clf = MLPClassifier(solver = 'lbfgs', alpha = 1e-5, hidden_layer_sizes = (30,30,30,30,30,30,30,30,30,30), random_state = 1);
clf.fit(X,y);

cnt = 0;
for Img in os.listdir(TestDir):
img = mpimg.imread("%s/%s" % (TestDir, Img));
img = rgb2gray(img);
img = img.flatten();
if clf.predict(img) == 1:
cnt += 1;
print "Sample = %d, vehicles = %d, rate = %f" % (cnt_1, cnt, (cnt+0.0) / cnt_1);
\endlstlisting

在文件开头已经\usepackagelistings
程序报错：!Incomplete \iffalse; all text was ignored after line 37. <inserted text>\fi import

参考技术A 把a\b\c改为：
self.a
self.b
self.c追问

请问您说的是哪里……？

将带有数字键的数据插入 mongodb 时出错（python 字典中的 GPS 数据）

【中文标题】将带有数字键的数据插入 mongodb 时出错（python 字典中的 GPS 数据）

【英文标题】：Error when Inserting data with numerical keys into mongodb (GPS data in a python dictionary)

【发布时间】：2020-02-04 01:27:06

【问题描述】：

我正在尝试使用pymongo 将一些图像元数据存储到MongoDB。但是插入时出现错误。

#Data in Dictionary
gps = 'GPSInfo': 1: 'N', 2: ((38, 1), (54, 1), (3540, 100)), 3: 'E', 4: ((1, 1), (26, 1), (1920, 100)), 5: b'\x00', 6: (0, 1), 7: ((11, 1), (7, 1), (47, 1)), 16: 'T', 17: (5338, 65), 29: '2011:09:04'


import pymongo
mng_client = pymongo.MongoClient('localhost', 27017)
mng_db = mng_client['pic_db'] 
collection_name = 'pic_audit_log2' 
db_cm = mng_db[collection_name]


# Insert data from a dictionary
db_cm.remove()
db_cm.insert(gps)

错误

InvalidDocument: documents must have only string keys, key was 1

我是否必须将所有数字字典键更改为字符串？ 当我这样做时它会起作用。

d = str(a):str(c):d for c,d in b.items() if isinstance(b,dict) else b for a,b in gps.items()

# Insert data from dictionary
db_cm.remove()
db_cm.insert(d)

还有其他更好的选择吗？

【参考方案1】：

在插入数据时，mongo shell 会为您将整数转换为字符串，但 pymongo 不会。您的解决方法可能与任何解决方法一样好。