Julia, bir dosya yerine bir akıştan okunabilir

Question

Bir ağ url'sinden veya runpipe harici komuttan bir tabloyu okumak için bir yol var mı? DataFrame.readtable sadece dosyadan okumayı destekliyor gibi görünüyor.

Ar Örneğin Yapabileceğimiz:

df = read.table(url("http://example.com/data.txt")) 

x = read.table(pipe("zcat data.txt | sed /^#/d | cut -f '11-13'"), colClasses=c("integer","integer","integer"), fill=TRUE, row.names=NULL) 

Answer 1

using DataFrames, Requests 

julia> resp = get("https://data.cityofnewyork.us/api/views/kku6-nxdu/rows.csv?accessType=DOWNLOAD") 
Response(200 OK, 17 headers, 27350 bytes in body) 

julia> tbl = readtable(IOBuffer(resp.data)); 

julia> names(tbl) 
46-element Array{Symbol,1}: 
:JURISDICTION_NAME     
:COUNT_PARTICIPANTS     
:COUNT_FEMALE      
:PERCENT_FEMALE      
:COUNT_MALE       
:PERCENT_MALE      
:COUNT_GENDER_UNKNOWN    
:PERCENT_GENDER_UNKNOWN    
:COUNT_GENDER_TOTAL     
:PERCENT_GENDER_TOTAL    
:COUNT_PACIFIC_ISLANDER    
:PERCENT_PACIFIC_ISLANDER   
:COUNT_HISPANIC_LATINO    
:PERCENT_HISPANIC_LATINO    
:COUNT_AMERICAN_INDIAN    
:PERCENT_AMERICAN_INDIAN    
:COUNT_ASIAN_NON_HISPANIC   
⋮         
:PERCENT_PERMANENT_RESIDENT_ALIEN 
:COUNT_US_CITIZEN     
:PERCENT_US_CITIZEN     
:COUNT_OTHER_CITIZEN_STATUS   
:PERCENT_OTHER_CITIZEN_STATUS  
:COUNT_CITIZEN_STATUS_UNKNOWN  
:PERCENT_CITIZEN_STATUS_UNKNOWN  
:COUNT_CITIZEN_STATUS_TOTAL   
:PERCENT_CITIZEN_STATUS_TOTAL  
:COUNT_RECEIVES_PUBLIC_ASSISTANCE 
:PERCENT_RECEIVES_PUBLIC_ASSISTANCE 
:COUNT_NRECEIVES_PUBLIC_ASSISTANCE 
:PERCENT_NRECEIVES_PUBLIC_ASSISTANCE 
:COUNT_PUBLIC_ASSISTANCE_UNKNOWN  
:PERCENT_PUBLIC_ASSISTANCE_UNKNOWN 
:COUNT_PUBLIC_ASSISTANCE_TOTAL  
:PERCENT_PUBLIC_ASSISTANCE_TOTAL 

julia> eltypes(tbl) 
46-element Array{Type,1}: 
Int64 
Int64 
Int64 
Float64 
Int64 
Float64 
Int64 
Int64 
Int64 
Int64 
Int64 
Float64 
Int64 
Float64 
Int64 
Float64 
Int64 
⋮  
Float64 
Int64 
Float64 
Int64 
Float64 
Int64 
Int64 
Int64 
Int64 
Int64 
Float64 
Int64 
Float64 
Int64 
Int64 
Int64 
Int64