def compare_files_with_dictionary(file1_path, file2_path, key_column_index=0):
"""
Compares two files and finds corresponding rows based on a specified key column.
Args:
file1_path: Path to the first file.
file2_path: Path to the second file.
key_column_index: Index of the column to use as the key for comparison.
Returns:
A list of tuples, where each tuple contains a corresponding row from the first and second files.
"""
key_column_index = int(key_column_index)
# Read the contents of both files into lists of lines
with open(file1_path, "r") as f1, open(file2_path, "r") as f2:
lines1 = f1.readlines()
lines2 = f2.readlines()
# Create a dictionary to store rows from the first file, indexed by the key column
key_to_row1 = {}
for line1 in lines1:
row1 = line1.strip().split()
key = row1[key_column_index]
key_to_row1[key] = row1
# Find corresponding rows in the second file based on the key
corresponding_rows = []
for line2 in lines2:
row2 = line2.strip().split()
key = row2[key_column_index]
if key in key_to_row1:
corresponding_rows.append((key_to_row1[key], row2))
return corresponding_rows
# Example usage
file1_path = "file1.txt"
file2_path = "file2.txt"
key_column_index = 0 # Assuming the key is in the first column
corresponding_rows = compare_files_with_dictionary(file1_path, file2_path, key_column_index)
for row1, row2 in corresponding_rows:
print("Corresponding rows:")
print(row1)
print(row2)-
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Output
---------------apple---------- ----------applejuice---------- --------------banana----------Python Code
def header_with_text(txt): print('-'*(30-len(txt))+txt+'-'*10) return None #Execute header_with_text('apple') header_with_text('applejuice') header_with_text('banana')Description
# the print output consist of three parts, # first part (just some '-') and second part (text) together share "always" the same length (20 chars), in this same length area, text is right aligned, # third part (just 10 times '-') # all parts together is fixed length 30 -
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f = open("file.txt", "r")
lines = f.readlines()
print(lines) -
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- from the directory, where the script is executed,
- the file called “filename.txt” is opened, just for reading purposes,
- all lines of the file are interpeted as objects in a list
- in a loop, every object of this list is printed to the main output.
f = open("filename.txt", "r") lines = f.readlines() for line in lines: print(line, end="")