Q$1$: Date Parser with Validation

File: q$1.$py

Implement a function called parse$\_$date$($year$\_$str$,$ month$\_$str$,$ day$\_$str$)$ that:

Attempts to convert year$\_$str$,$ month$\_$str$,$ and day$\_$str into integers.

Validates that the year is between $1900$ and $2100.$

Validates that the month is between $1$ and $12.$

Validates that the day is valid for the given month and year $($e$.$g$.,$ February $30$ should not be allowed$).$

Returns the date as a string

Use Python's datetime module to attempt creating a datetime.date object. This will naturally raise a ValueError for invalid dates, which you should catch and re$-$raise with a more descriptive message.

Example Usage of datetime.date function:

year $=2024$ month $=12$ day $=30$ date $=$ datetime.date$($year$,$ month, day$)$ print$($date$)$ # Output: $2020-02-29$

Error Conditions:

If any of year$\_$str$,$ month$\_$str$,$ or day$\_$str cannot be converted to an integer, raise a ValueError with the message:

"Year, month, and day strings must contain integers."

If year is outside the range $[1900,2100],$ raise a custom exception YearRangeError with the message:

"Year must be between $1900$ and $2100."$

If the date is invalid $($e$.$g$.,$ April $31,$ or month$=13,$ or day$=0),$ raise a ValueError with the message:

"Invalid date specified."

If Successful:

Return the date as a string in the format $"$YYYY$-$MM$-$DD$".$

Example Usage:

parse$\_$date$("2020","02","29")$ # returns $"2020-02-29"$ parse$\_$date$("1899","12","15")$ # raises YearRangeError$("$Year must be between $1900$ and $2100.")$ parse$\_$date$("2021","13","10")$ # raises ValueError$("$Invalid date specified."$)$ parse$\_$date$("2021",$ "Feb", $"10")$ # raises ValueError$("$Year$,$ month, and day must be integers."$)$

Q$2$: Tab$-$Delimited File Validator

File: q$2.$py

Implement a function validate$\_$tab$\_$file$($file$\_$path, expected$\_$fields, required$\_$pattern$)$ that:

Attempts to open and read a file line$-$by$-$line.

Checks that each line contains exactly expected$\_$fields fields, separated by tabs $(\text{'}\backslash$t$\text{'}).$

Confirms that at least one line contains a field that matches the given required$\_$pattern $($a substring$).$

You will create and use a custom exception TabFileValidationError to handle validation failures.

Behavior:

If the file is not found, return "File not found."

If any line does not have the correct number of fields $($expected$\_$fields$),$ raise TabFileValidationError.

Include in the exception message:

The file$\_$pathThe line number $(1-$based index$)$ of the first offending lineThe discrepancy in the number of fields found vs$.$ expected

If none of the lines contains a field that includes required$\_$pattern as a substring, raise TabFileValidationError indicating the missing pattern.

Normal Output:

If all criteria are met, return "Tab$-$delimited file validation passed."

Custom Exception Details:

TabFileValidationError should provide clear, detailed information. For example:

If a line is malformed:

"File path: data.txt$,$ Line $3$: Expected $4$ fields, found $2."$If the required pattern is missing:

"File path: data.txt$,$ No field contains required pattern 'user$\_$id$\text{'}."$

FileNotFoundError should provide:

File Not Found. If the file does not exist.

Example Usage:

# Suppose data.txt contents are: # name age country email # John $30$ Canada john@example.com # Alice $25$ USA alice@example.com validate$\_$tab$\_$file$("$data$.$txt$",$ expected$\_$fields$=4,$ required$\_$pattern$=$"example"$)$ # returns "Tab$-$delimited file validation passed." validate$\_$tab$\_$file$("$data$.$txt$",$ expected$\_$fields$=4,$ required$\_$pattern$=$"missing$\_$pattern"$)$ # raises TabFileValidationError$("$File path: data.txt$,$ No field contains required pattern 'missing$\_$pattern'."$)$ validate$\_$tab$\_$file$("$missing$\_$file.txt$",4,$ "example"$)$ # returns "File not found." # If data.txt had a line with fewer fields, for example: # John $30$ Canada validate$\_$tab$\_$file$("$data$.$txt$",4,$ "example"$)$ # raises TabFileValidationError$("$File path: data.txt$,$ Line $2$: Expected $4$ fields, found $3.")$