generator

gen.py

lines = 30000
types = {
  "date" : "01-04-2015",
  "string" : "hello",
  "number" : "10000"
}

class Column(object):

  def __init__(self, name, t):
    self.name = name
    self.t = t

date_columns = [Column("date-{0}".format(i), "date") for i in range(100)]
string_columns = [Column("string-{0}".format(i), "string") for i in range(100)]
number_columns = [Column("number-{0}".format(i), "number")  for i in range(100)]
all = date_columns + string_columns + number_columns

print ",".join([c.name for c in all])

for i in range(lines):
  print ",".join( [types[c.t] for c in all])