csv

问题 I have a simple CSV file that I can't figure out how to pull into a dataframe. test.csv h1 h2 h3 11 12 13 h4 h5 h6 14 15 16 As you can see if the csv above was split into two separate files then reading them into a dataframe would be easy. There is a space between each set of data and they are always the same length. Dataframe I want to create: h1 h2 h3 h4 h5 h6 11 12 13 14 15 16 回答1: Less efficient and clever than CT Zhu's solution but maybe a little simpler: import pandas as pd from

问题 I have a simple CSV file that I can't figure out how to pull into a dataframe. test.csv h1 h2 h3 11 12 13 h4 h5 h6 14 15 16 As you can see if the csv above was split into two separate files then reading them into a dataframe would be easy. There is a space between each set of data and they are always the same length. Dataframe I want to create: h1 h2 h3 h4 h5 h6 11 12 13 14 15 16 回答1: Less efficient and clever than CT Zhu's solution but maybe a little simpler: import pandas as pd from

问题 I have a dataframe import pandas as pd df = pd.DataFrame([[1, 2], [3, 4]], columns=['a', 'b']) I want to write df to a csv file but not using the columns ['a', 'b'] . The first line is my custom string and the rest are the content of df.values . For example: numrows numcols note 1 2 3 4 Can I do this with pandas or I have to manually loop through the content and write to file? 回答1: You can first create a csv file with the custom text in the first line, and then append the dataframe to it.

问题 I am using PHP to expose vehicle GPS data from a CSV file. This data is captured at least every 30 seconds for over 70 vehicles and includes 19 columns of data. This produces several thousand rows of data and file sizes around 614kb. New data is appended to end of the file. I need to pull out the last row of data for each vehicle, which should represent the most the recent status. I am able to pull out one row for each unit, however since the CSV file is in chronological order I am pulling

问题 I need a piece of advice how to transfer data from R into Oracle table. I have a R-dataframe and I would like to transfer it into the specific Oracle table (the whole dataframe or some columns). As an option, transfer dataframe which is placed in a csv file via R into Oracle. I have scanned similar items throughout the inet but not find a clear and plain examples. 回答1: Check the metrod dbWriteTable of the package RJDBC Here an example dbWriteTable(jdbcConnection,"TABLE_NAME",data.frame.name.,

问题 I have to export data from dictionary to csv. Dictionary contains lists. I tried to do export like this with open("info.csv", 'w',newline='')as csvfile: header = ['Club', 'Stadium'] writer = csv.DictWriter(csvfile, fieldnames=header) writer.writeheader() writer.writerow(info) But the result is Club Stadium ['Arsenal, ['Emirates', 'AFC', etc.] 'Villia park',etc.] And i wanted this Club Stadium Arsenal Emirates AFC Villia park How can i do it? 回答1: You can accomplish what you want doing it like

问题 Say I have a hashmap with String type as key and ArrayList type as value, example {"value1"=["one","three","five"], "value2"=["two","four","six"]} where "value1" and "value2" are keys. I want to write the above hashmap data in following format. (so that I can read the csv file in excel) value1,value2 one,two three,four five,six My idea was to write the first key and its values as follows value1 one three five Then I was thinking of using the seek method in RandomAccessFile class to back to

问题 Any idea how to let the user choose the filename to save using this function ? write.csv(tweets, file = "newfile.csv", row.names = TRUE, sep = ',', col.names = TRUE) Something like how we use the save as function and then a browser option appears. 回答1: Try ?file.choose. That should bring up the window that lets you navigate to the folder you want, and enter the file name you want to save under. That is: write.csv(tweets, file=file.choose(), row.names=TRUE, sep=',', col.names=TRUE) 回答2:

问题 I'm importing a CSV file into Heidi SQL. I've created the table using this code: create table all_data ( Keyword varchar(1000), Position int, Previous_Position int, Search_Volume int, KW_Difficulty float, URL varchar(1000), Post_title varchar(1000), Post_URL varchar(1000), Genre varchar(1000), Location varchar(1000), Avg_Daily_Visitors float, pageviews int ) ; but in the Avg_Daily_visitors column it has "\N" where there is no value. I've been importing the data with this code: load data local

问题 I've created a program which finds the minimum of each row of a CSV file and I would now like to do the same for each column, however I have been unable to do so. Any advice would be greatly appreciated thank you. #Import and convert csv import csv data = [] with open(file,"r") as f: reader = csv.reader(f, delimiter=',') #make sure csv uses "." not "," !!!!! nump = 0 for row in reader: floatrow = [] for val in row: floatrow.append(float(val)) nump += len(floatrow) data.append(floatrow)