webinar-files-2023-04-05

# Files 2023 4 15

# FILES!!!
# READ MODE
# filename = input()
# with open("test.txt", "r") as f:
#     # readlines() is a useful file object method
#     contents = f.readlines() # list of strings, line by line
#
# print(contents)
# print(type(contents).__name__)
# # for loop
# for line in contents:
#     # line = line.strip()
#     print(line, end="") # print(line, end="\n")
# print()

# print("This should start on a clean new line!")

# CSV Module
import csv # csv module is reader()
with open("mock_data.csv", "r") as f1:
    # contents = f.readlines()  # list of strings, line by line
    contents = list(csv.reader(f1)) # csv.reader(f1, delimiter="\t")
# print(contents[:30])

# WRITE MODE
with open("output_data.csv", "w") as f2:
    for row in contents:
        # email is row[3]
        # how to check end of email string? 1) slice 2) str endswith() 3) IN keyword
        if row[3][-4:] == ".gov": # if row[3].endswith(".gov"):
            # print(row) # just checking! Slice is good and data looks good
            # write() method takes one single str argument
            f2.write(",".join(row)+"\n") # is that enough...?


# for method in dir(str):
#     if not method.startswith("_"):
#         print(f"{method}()")

# APPEND MODE
# with open("append_to_this.txt", "r") as f3:
#     contents = f3.readlines()
# print(contents) # ['Frodo\n', 'Sam\n', 'Merry\n']
with open("append_to_this.txt", "a") as f3:
    # f3.write("Pippin\n")
    # f3.write("Aragorn\n")
    # f3.write("Gandalf\n")
    f3.write("Gollum\nGlorfindel\nRosie Cotton\n") # you can call write() multiple times, or just add all those strings together