step-3 completed

Author: sambitr

Build your own cut tool/README.md

@@ -24,3 +24,27 @@ Song title
 "Adore You"
 "Africa"
 ```
+
+### Step: 3
+
+```
+$ cut -f"1 2 3" sample.tsv
+f0      f1      f2
+0       1       2
+5       6       7
+10      11      12
+15      16      17
+20      21      22
+```
+
+$ cut -f1,2 sample.tsv
+
+```
+f0      f1
+0       1
+5       6
+10      11
+15      16
+20      21
+```
+

Build your own cut tool/cut.py

@@ -18,8 +18,23 @@
         print(line.split(delemeter)[int(field_num)-1])
 else:
     file_name = sys.argv[2]
-    #print(field, field_num, file_name)
-
     file_content = open(file_name)
-    for line in  file_content.readlines():
-        print(line.split("\t")[int(field_num)-1])
+    print(field, field_num, file_name)
+
+    field_num_list = []
+    if (len(field_num) >= 2):
+        ## This is for supporting the case for cut -f1,2 sample.tsv & cut -d, -f"1 2" fourchords.csv
+        field_num_list = field_num.split(field_num[1]) # split on the basis of delemeter 
+        for line in  file_content.readlines():
+            selected_columns = []
+            for columnnum in field_num_list:
+                selected_columns.append(line.split("\t")[int(columnnum)-1])
+            print("\t".join(selected_columns))
+    else:
+        ## below section is to print based on the default delemeter tab. E.X: cut -f2 sample.tsv
+        for line in  file_content.readlines():
+            print(line.split("\t")[int(field_num)-1])
+
+
+    
+