Research Summary / programming FAQs

1. utilize Python Calculate the actual distance between the two places through longitude and latitude
The formula ：D = arccos((sin North latitude A×sin North latitude B)＋(cos North latitude A×cos North latitude B×cosAB Longitude difference between the two places ))× The average radius of the earth (Shormin) The average radius of the earth is 6371.004 km,D The unit is km
① The formula calculates the distance between two points （m）

from math import radians, cos, sin, asin, sqrt
def geodistance(lng1,lat1,lng2,lat2):
　　#lng1,lat1,lng2,lat2 = (120.12,30.28,115.86,28.74)
　　lng1, lat1, lng2, lat2 = map(radians, [float(lng1), float(lat1), float(lng2), float(lat2)])  # Conversion of longitude and latitude to radian 
　　dlon=lng2-lng1
　　dlat=lat2-lat1
　　a=sin(dlat/2)**2 + cos(lat1) * cos(lat2) * sin(dlon/2)**2 
　　distance=2*asin(sqrt(a))*6371*1000   #  The average radius of the earth ,6371km
　　distance=round(distance/1000,3)
　　return distance

② call geopy package

from geopy.distance import geodesic
print(geodesic((30.28,120.12), (28.74,115.86)).m) # Calculate the distance between two coordinate lines 
print(geodesic((30.28,120.12), (28.74,115.86)).km) 

cmd Install under window tensorflow Solve the problem of long response time

pip install tensorflow -i http://mirrors.aliyun.com/pypi/simple/ --trusted-host mirrors.aliyun.com

Installed under the system compiler

Programming bug:
①AttributeError: ‘NoneType’ object has no attribute ‘val’
Generally, the tree structure does not judge whether it exists .
② If a string composed of non pure numbers is forcibly converted to an integer, an error will be reported ：
ValueError: invalid literal for int() with base 10
③AttributeError: module ‘pandas’ has no attribute ‘Series’（ And similar situations ）
It may be due to the following reasons ：
（1） package Failed to install successfully or update to the latest version ;
（2） There is a problem with your file name , For example, in the above case, name the file pandas.py.
Or your other files are named pandas Of .（ Own mistakes ）
④pycharm Printing big data files is incomplete ：
solve ： Add this line of code :

 pd.set_option('display.max_columns', None)

problem 1. describe ： No Internet connection , Open the app as initialization failure:0X0000000c :

resolvent ：① Open the console as an administrator .
② Input “NETSH WINSOCK RESET CATALOG”.
③ enter , Tips Reset winsock Catalog success . Restart the computer to complete the configuration .

problem 2： Computer Icon disappear

resolvent ： Personalization - > The theme -> Desktop icon settings