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Skipping execution of -with- block
According to PEP-343, a with statement translates from: with EXPR as VAR: BLOCK to: mgr = (EXPR) exit = type(mgr).__exit__ # Not calling it yet value = type(mgr).__enter__(mgr) exc = True try: try: VAR = value # Only if “as VAR” is present BLOCK except: # The exceptional case is handled here exc = False … Read more
read.csv, header on first line, skip second line [duplicate]
This should do the trick: all_content = readLines(“file.csv”) skip_second = all_content[-2] dat = read.csv(textConnection(skip_second), header = TRUE, stringsAsFactors = FALSE) The first step using readLines reads the entire file into a list, where each item in the list represents a line in the file. Next, you discard the second line using the fact that negative … Read more
Print a file, skipping the first X lines, in Bash [duplicate]
You’ll need tail. Some examples: $ tail great-big-file.log < Last 10 lines of great-big-file.log > If you really need to SKIP a particular number of “first” lines, use $ tail -n +<N+1> <filename> < filename, excluding first N lines. > That is, if you want to skip N lines, you start printing line N+1. Example: … Read more
LINQ Partition List into Lists of 8 members [duplicate]
Use the following extension method to break the input into subsets public static class IEnumerableExtensions { public static IEnumerable<List<T>> InSetsOf<T>(this IEnumerable<T> source, int max) { List<T> toReturn = new List<T>(max); foreach(var item in source) { toReturn.Add(item); if (toReturn.Count == max) { yield return toReturn; toReturn = new List<T>(max); } } if (toReturn.Any()) { yield return … Read more
Skip first couple of lines while reading lines in Python file
Use a slice, like below: with open(‘yourfile.txt’) as f: lines_after_17 = f.readlines()[17:] If the file is too big to load in memory: with open(‘yourfile.txt’) as f: for _ in range(17): next(f) for line in f: # do stuff